ENCYCLOPEDIA

An aquarium (plural aquariums or aquaria) is a vivarium consisting of at least one transparent side in which water-dwelling plants or animals are kept. Fishkeepers use aquaria to keep fish, invertebrates, amphibians, marine mammals, turtles, and aquatic plants. The term combines the Latin root aqua, meaning water, with the suffix -arium, meaning “a place for relating to”.

An aquarist owns or maintains an aquarium, typically constructed of glass or high-strength plastic. Cuboid aquaria are also known as fish tanks or simply tanks, while bowl-shaped aquaria are also known as fish bowls. Size can range from a small glass bowl to immense public aquaria. Specialised equipment maintains appropriate water quality and other characteristics suitable for the aquarium’s residents.

In the Roman Empire, the first fish to be brought indoors was the sea barbel, which was kept under guest beds in small tanks made of marble. Introduction of glass panes around the year 50 allowed Romans to replace one wall of marble tanks, improving their view of the fish. In 1369, the Chinese Emperor, Hongwu, established a porcelain company that produced large porcelain tubs for maintaining goldfish; over time, people produced tubs that approached the shape of modern fish bowls. Leonhard Baldner, who wrote Vogel-, Fisch- und Tierbuch (Bird, Fish, and Animal Book) in 1666, maintained weather loaches and newts.

In 1836, soon after his invention of the Wardian case, Ward proposed to use his tanks for tropical animals, and in 1841 he did so, though only with aquatic plants and toy fish. However, he soon housed real animals. In 1838, Félix Dujardin noted owning a saltwater aquarium, though he did not use the term. In 1846, Anna Thynne maintained stony corals and seaweed for almost three years, and was credited as the creator of the first balanced marine aquarium in London. At about the same time, Robert Warington experimented with a 13-gallon container, which contained goldfish, eelgrass, and snails, creating one of the first stable aquaria; he published his findings in 1850 in the Chemical Society’s journal.

The keeping of fish in an aquarium became a popular hobby and spread quickly. In the United Kingdom, it became popular after ornate aquaria in cast iron frames were featured at the Great Exhibition of 1851. In 1853, the first large public aquarium opened in the London Zoo and came to be known as the Fish House. Philip Henry Gosse was the first person to actually use the word “aquarium”, opting for this term (instead of “vivarium”) in 1854 in his book The Aquarium: An Unveiling of the Wonders of the Deep Sea. In this book, Gosse primarily discussed saltwater aquaria. In the 1850s, the aquarium became a fad in the United Kingdom.

Germans soon rivaled the British in their interest. In 1854, an anonymous author had two articles published about the saltwater aquaria of the United Kingdom: Die Gartenlaube (The Garden House) entitled Der Ocean auf dem Tische (The Ocean on the Table). However, in 1856, Der See im Glase (The Lake in a Glass) was published, discussing freshwater aquaria, which were much easier to maintain in landlocked areas. During the 1870s, some of the first aquarist societies were appearing in Germany. The United States soon followed. Published in 1858, Henry D. Butler’s The Family Aquarium was one of the first books written in the United States solely about the aquarium. According to the July issue of The North American Review of the same year, William Stimson may have owned some of the first functional aquaria, and had as many as seven or eight. The first aquarist society in the United States was founded in New York City in 1893, followed by others. The New York Aquarium Journal, first published in October 1876, is considered to be the world’s first aquarium magazine.

In the Victorian era in the United Kingdom, a common design for the home aquarium was a glass front with the other sides made of wood (made watertight with a pitch coating). The bottom would be made of slate and heated from below. More advanced systems soon began to be introduced, along with tanks of glass in metal frames. During the latter half of the 19th century, a variety of aquarium designs were explored, such as hanging the aquarium on a wall, mounting it as part of a window, or even combining it with a birdcage.

Aquaria became more widely popular as houses had an electricity supply after World War I. Electricity allowed artificial lighting as well as aeration, filtration, and heating of the water. Initially, amateur aquarists kept native fish (with the exception of goldfish); the availability of exotic species from overseas further increased the popularity of the aquarium. Jugs made from a variety of materials were used to import fish from overseas, with a bicycle foot pump for aeration. Plastic shipping bags were introduced in the 1950s, making it easier to ship fish. The eventual availability of air freight, allowed fish to be successfully imported from distant regions. In the 1960s metal frames made marine aquaria almost impossible due to corrosion, but the development of tar and silicone sealant allowed the first all-glass aquaria made by Martin Horowitz in Los Angeles, CA. The frames remained, however, though purely for aesthetic reasons.

There are now around 60 million aquarists worldwide. In the United States, aquarium keeping is the second-most popular hobby after stamp collecting. In 1999 it was estimated that over nine million U.S. households own an aquarium. Figures from the 2005/2006 APPMA National Pet Owners Survey report that Americans own approximately 139 million freshwater fish and 9.6 million saltwater fish. Estimates of the numbers of fish kept in aquaria in Germany suggest at least 36 million. The hobby has the strongest following in Europe, Asia, and North America. In the United States, 40 percent of aquarists maintain two or more tanks.

Design

Materials

Most aquaria consist of glass panes bonded together by silicone, with plastic frames that are attached to the upper and lower edges for decoration. The glass aquarium is standard for sizes up to about 1000 litres (250 gal). However, glass is brittle and has very little give before fracturing, though generally the sealant fails first. Aquaria come in a variety of shapes such as cuboid, hexagonal, angled to fit in a corner (L-shaped), bow-front (the front side curves outwards). Fish bowls are generally either plastic or glass, either spherical or some other round configuration.

Acrylic aquaria are also available and are the primary competitor with glass. Acrylics are stronger than glass, and much lighter. Acrylic-soluble cements are used to directly fuse acrylic together (as opposed to simply sealing the seam). Acrylic allows for the formation of unusual shapes, such as hexagonal. Compared to glass, acrylics are easy to scratch; care must be taken with organisms with shells and teeth.

Laminated glass might be used, which combines the advantages of both glass and acrylic.

Large aquaria might use stronger materials such as fiberglass-reinforced plastics. However, this material is not transparent. Reinforced concrete is used for aquaria where weight and space are not factors. Concrete must be coated with a waterproof layer to prevent the water from breaking down the concrete as well as prevent contamination from the concrete.

Styles
Aquariums have been fashioned into coffee tables, sinks, and even toilets. Another such example is the Macquarium, an aquarium made from the shell of an Apple Macintosh computer.

A kreisel tank is a circular aquarium designed to hold delicate animals such as jellyfish. These aquariums provide slow, circular water flow with a lack of physical objects. Originally a German design (kreisel means spinning top), the tank has no sharp corners, and keeps the housed animals away from the plumbing. Water moving into the tank gives a gentle flow that keeps the inhabitants suspended, and water leaving the tank is covered by a delicate screen that prevents the inhabitants from getting stuck. There are several types of kreisel tanks. In a true kreisel, a circular tank has a circular, submerged lid. Pseudokreisels have a curved bottom surface and a flat top surface, similar to the shape of either a “U” or a semicircle. It is possible to combine these designs; a circular shaped tank is used without a lid or cover, and the surface of the water acts as the continuation of circular flow.

Aquarium size and volume

An aquarium can range from a small glass bowl containing less than a litre (34 fl.oz.) of water to immense public aquaria which can house entire ecosystems such as kelp forests. Larger aquaria are typically recommended to hobbyists due to their resistance to rapid fluctuations of temperature and pH, allowing for greater system stability.

Reef aquaria under 100 litres (20 gal) have a special place in the aquarium hobby; these aquaria, termed nano reefs (when used in reefkeeping), have a small water volume.

Practical limitations, most notably the weight (one litre of fresh water has a mass of 1 kilogram (8.3 lb gal-1), and salt water is even denser) and internal water pressure (requiring thick, strong glass siding) of a large aquarium, keep most home aquaria to a maximum of around 1 cubic metre in volume (1,000 kg or 2,200 lb). Some aquarists, however, have constructed aquaria of up to many thousands of litres.

Aquaria within public aquariums designed for exhibition of large species or environments can be dramatically larger than any home aquarium. The Georgia Aquarium, for example, features an individual aquarium of 6,300,000 US gallons (23,800 m3).

Components

Filtration system in a typical aquarium:
(1) Intake.
(2) Mechanical filtration.
(3) Chemical filtration.
(4) Biological filtration medium.
(5) Outflow to tank.

The typical hobbyist aquarium will include a filtration system, an artificial lighting system, and a heater or chiller depending on the inhabitants of the aquarium. Many aquaria incorporate a hood, which prevents evaporation and protects fish from leaving the aquarium (or anything else from entering the aquarium). They also often hold lights.

Combined biological and mechanical aquarium filtration systems are commonly used; these are designed to either convert ammonia to nitrate or remove it or sometimes remove phosphate from water, removing nitrogen being at the expense of aquatic plants. Particulates incorporated into the filter can provide energy for microbes and sponges that do things like nitration. Filtration systems are often the most complex component of home aquaria.

Aquarium heaters combine a heating element with a thermostat, allowing an aquarist to regulate water temperature at a level above that of the surrounding air, whereas coolers and chillers (refrigeration devices) are for use in cold water aquaria, or anywhere the ambient room temperature is above the desired tank temperature. Thermometers used include glass alcohol thermometers, adhesive external plastic strip thermometers, and battery-powered LCD thermometers. In addition, some aquarists use air pumps attached to airstones or water pumps to increase water circulation and supply adequate gas exchange at the water surface. Wave-making devices have also been constructed to provide wave action.

An aquarium’s physical characteristics form another aspect of aquarium design. Size, lighting conditions, density of floating and rooted plants, placement of bogwood, creation of caves or overhangs, type of substrate, and other factors (including an aquarium’s positioning within a room) can all affect the behavior and survival of tank inhabitants.

An aquarium can be placed on an aquarium stand. Because of the weight of the aquarium, a stand must be strong as well as level. A tank that is not level may distort, leak, or crack. These are often built like cabinets to allow storage, available in many styles so it can match room decor. Simple metal tank stands are also available. Some sources say that polystyrene should be placed under the aquarium as a safety precaution.

Aquarium maintenance

Large volumes of water enable more stability in a tank by diluting effects from death or contamination. Any event that perturbs the system pushes an aquarium away from equilibrium; the more water that is contained in a tank, the easier such a systemic shock is to absorb, as the effects of that event are diluted. For example, the death of the only fish in a three U.S. gallon tank (11 L) causes dramatic changes in the system, while the death of that same fish in a 100 U.S. gallon (400 L) tank with many other fish in it represents only a minor change in the balance of the tank. For this reason, hobbyists often favor larger tanks, as they are more stable systems requiring less attention to the maintenance of equilibrium.

There are a variety of nutrient cycles that are important in the aquarium. Dissolved oxygen enters the system at the surface water-air interface or through the actions of an air pump. Carbon dioxide escapes the system into the air. The phosphate cycle is an important, although often overlooked, nutrient cycle. Sulfur, iron, and micronutrients also cycle through the system, entering as food and exiting as waste. Appropriate handling of the nitrogen cycle, along with supplying an adequately balanced food supply and considered biological loading, is enough to keep these other nutrient cycles in approximate equilibrium, but not forever.

Water conditions

The solute content of water is perhaps the most important aspect of water conditions, as total dissolved solids and other constituents can dramatically impact basic water chemistry, and therefore how organisms are able to interact with their environment. Salt content, or salinity, is the most basic classification of water conditions. An aquarium may have fresh water (salinity below 500 parts per million), simulating a lake or river environment; brackish water (a salt level of 500 to 30,000 PPM), simulating environments lying between fresh and salt, such as estuaries; and salt water or sea water (a salt level of 30,000 to 40,000 PPM), simulating an ocean or sea environment. Rarely, even higher salt concentrations are maintained in specialized tanks for raising brine organisms.

Saltwater is typically alkaline, while the pH (alkalinity or acidicity) of fresh water varies more. Hardness measures overall dissolved mineral content; hard or soft water may be preferred. Hard water is usually alkaline, while soft water is usually neutral to acidic. Dissolved organic content and dissolved gases content are also important factors.

Home aquarists typically use tap water supplied through their local water supply network to fill their tanks. Because of the concentration of chlorine used to disinfect drinking water supplies for human consumption, straight tap water cannot be used in countries that pipe chlorinated water. In the past, it was possible to “condition” the water by simply letting the water stand for a day or two, which allows the chlorine time to dissipate. However, chloramine is now used more often as it is much stabler and will not leave the water as readily. Additives formulated to remove chlorine or chloramine are often all that is needed to make the water ready for aquarium use. Brackish or saltwater aquaria require the addition of a mixture of salts and other minerals, which are commercially available.

More sophisticated aquarists may make other modifications to their base water source to modify the water’s alkalinity, hardness, or dissolved content of organics and gases, before adding it to their aquaria. This can be accomplished by additives, such as sodium bicarbonate, to raise pH. Some aquarists will filter or purify their water prior to adding it to their aquarium. There are two processes used: deionization or reverse osmosis. In contrast, public aquaria with large water needs often locate themselves near a natural water source (such as a river, lake, or ocean) in order to have access to water that does not require much further treatment.

The temperature of the water forms the basis of one of the two most basic aquarium classifications: tropical vs. cold water. Most fish and plant species tolerate only a limited range of water temperatures: Tropical or warm water aquaria, with an average temperature of about 25 °C (77 °F), are much more common. Cold water aquaria are those with temperatures below what would be considered tropical; some varieties of fish are better suited to this cooler environment. More important than the temperature range itself is the consistency in temperature; most organisms are not accustomed to sudden changes in temperatures, which could cause shock and lead to disease. Water temperature can be regulated with a combined thermostat and heater unit (or, more rarely, with a cooling unit).

Water movement can also be important in accurately simulating a natural ecosystem. Aquarists may prefer anything from still water up to swift simulated currents in an aquarium, depending on the conditions best suited for the aquarium’s inhabitants. Water movement can be controlled through the use of aeration from air pumps, powerheads, and careful design of internal water flow (such as location of filtration system points of inflow and outflow).

Nitrogen cycle

Of primary concern to the aquarist is management of the biological waste produced by an aquarium’s inhabitants. Fish, invertebrates, fungi, and some bacteria excrete nitrogen waste in the form of ammonia (which will convert to ammonium, in acidic water) and must then pass through the nitrogen cycle. Ammonia is also produced through the decomposition of plant and animal matter, including fecal matter and other detritus. Nitrogen waste products become toxic to fish and other aquarium inhabitants at high concentrations.

The process
A well-balanced tank contains organisms that are able to metabolize the waste products of other aquarium residents. The nitrogen waste produced in a tank is metabolized in aquaria by a type of bacteria known as nitrifiers (genus Nitrosomonas). Nitrifying bacteria capture ammonia from the water and metabolize it to produce nitrite. Nitrite is also highly toxic to fish in high concentrations. Another type of bacteria, genus Nitrospira, converts nitrite into nitrate, a less toxic substance to aquarium inhabitants. (Nitrobacter bacteria were previously believed to fill this role, and continue to be found in commercially available products sold as kits to “jump start” the nitrogen cycle in an aquarium. While biologically they could theoretically fill the same niche as Nitrospira, it has recently been found that Nitrobacter are not present in detectable levels in established aquaria, while Nitrospira are plentiful.) This process is known in the aquarium hobby as the nitrogen cycle.

In addition to bacteria, aquatic plants also eliminate nitrogen waste by metabolizing ammonia and nitrate. When plants metabolize nitrogen compounds, they remove nitrogen from the water by using it to build biomass that decays more slowly than ammonia-driven plankton already dissolved in the water.

Maintaining the nitrogen cycle
Although informally called the nitrogen cycle by hobbyists, it is in fact only a portion of a true cycle: nitrogen must be added to the system (usually through food provided to the tank inhabitants), and nitrates accumulate in the water at the end of the process, or become bound in the biomass of plants. This accumulation of nitrates in home aquaria requires the aquarium keeper to remove water that is high in nitrates, or remove plants which have grown from the nitrates.

Aquaria kept by hobbyists often do not have the populations of bacteria needed to detoxify nitrogen waste from tank inhabitants. This problem is most often addressed through two filtration solutions: Activated carbon filters absorb nitrogen compounds and other toxins from the water, while biological filters provide a medium designed for colonization by the desired nitrifying bacteria. Activated carbon and other substances, such as ammonia absorbing resines, will stop working when their pores get full, so these components have to be replaced with fresh stocks constantly.

New aquaria often have problems associated with the nitrogen cycle due to insufficient number of beneficial bacteria, known as “New Tank Syndrome”. Therefore new tanks have to be matured before stocking them with fish. There are three basic approaches to this: the “fishless cycle” the “silent cycle” and “slow growth”.

No fish are kept in a tank undergoing a “fishless” cycle. Instead, small amounts of ammonia are added to the tank to feed the bacteria being cultured. During this process, ammonia, nitrite, and nitrate levels are tested to monitor progress. The “silent” cycle is basically nothing more than densely stocking the aquarium with fast-growing aquatic plants and relying on them to consume the nitrogen, allowing the necessary bacterial populations time to develop. According to anecdotal reports of aquarists specializing in planted tanks, the plants can consume nitrogenous waste so efficiently that the spikes in ammonia and nitrite levels normally seen in more traditional cycling methods are greatly reduced, if they are detectable at all. “Slow growth” entails slowly increasing the population of fish over a period of 6 to 8 weeks, giving bacteria colonies time to grow and stabilize with the increase in fish waste.

The largest bacterial populations are found in the filter; efficient filtration is vital. Sometimes, a vigorous cleaning of the filter is enough to seriously disturb the biological balance of an aquarium. Therefore, it is recommended to rinse mechanical filters in an outside bucket of aquarium water to dislodge organic materials that contribute to nitrate problems, while preserving bacteria populations. Another safe practice consists of cleaning only one half of the filter media every time the filter or filters are serviced.

Biological loading

Biological loading is a measure of the burden placed on the aquarium ecosystem by its living inhabitants. High biological loading in an aquarium represents a more complicated tank ecology, which in turn means that equilibrium is easier to perturb. In addition, there are several fundamental constraints on biological loading based on the size of an aquarium. The surface area of water exposed to air limits dissolved oxygen intake by the tank. The capacity of nitrifying bacteria is limited by the physical space they have available to colonize. Physically, only a limited size and number of plants and animals can be fit into an aquarium while still providing room for movement. Simply, all kinds of biology decay, and biological loading refers to that rate of decay in proportion to tank volume.

Calculating aquarium capacity

An aquarium can only support a certain number of fish. Limiting factors include the availability of oxygen in the water and the rate at which the filtration can process waste. Aquarists have developed rules of thumb to estimate the number of fish that can be kept in an aquarium; the examples below are for small freshwater fish, larger freshwater fishes and most marine fishes need much more generous allowances.

3 cm of adult fish length per 4 litres of water (i.e., a 6 cm-long fish would need about 8 litres of water).
1 cm of adult fish length per 30 square centimetres of surface area.
1 inch of adult fish length per gallon of water
1 inch of adult fish length per 12 square inches of surface area.

Experienced aquarists warn against applying these rules too strictly because they do not consider other important issues such as growth rate, activity level, social behaviour, surface area of plant life, and so on. To some degree, establishing the maximum loading capacity of an aquarium depends upon slowly adding fish and monitoring water quality over time, essentially a trial and error approach.

Factors affecting capacity
Though many conventional methods of calculating the capacity of aquarium are based on volume and pure length of fish, there are other variables. One variable is differences between fish. Smaller fish consume more oxygen per gram of body weight than larger fish. Labyrinth fish, having the capability to breathe atmospheric oxygen, are noted for not needing as much surface area (however, some of these fish are territorial, and may not appreciate crowding). Barbs also require more surface area than tetras of comparable size.

Oxygen exchange at the surface is an important constraint, and thus the surface area of the aquarium. Some aquarists go so far as to say that a deeper aquarium with more volume holds no more fish than a shallower aquarium of the same surface area. The capacity can be improved by surface movement and water circulation such as through aeration, which not only improves oxygen exchange, but also the decomposition of waste materials.

The presence of waste materials presents itself as a variable as well. Decomposition in solution tends to consume oxygen. Oxygen dissolves less readily in warmer water; this is a double-edged sword as warmer temperatures make more active fish, which in turn consume even more oxygen. Stress due to temperature changes is especially obvious in coldwater aquaria where the temperature may swing from low temperatures to high temperatures on hotter days.

Aquarium classifications

A planted freshwater aquarium

From the outdoor ponds and glass jars of antiquity, modern aquaria have evolved into a wide range of specialized systems. Individual aquaria can vary in size from a small bowl large enough for a single small fish, to the huge public aquaria that can simulate entire marine ecosystems.

One of ways to classify aquaria is their salinity. Freshwater aquaria are the most popular kind of aquarium due to their lower cost and ease of maintenance. Marine aquaria generally require more complex equipment to set up and maintain than freshwater aquaria. Along with fish species, marine aquaria frequently feature a diverse range of invertebrates. Brackish water aquaria combine elements of both marine and freshwater fishkeeping. Fish kept in brackish water aquaria generally come from habitats with varying salinity, such as mangroves and estuaries. Certain subtypes of aquaria also exist within these types, such as the reef aquarium, a type of marine aquarium that houses coral.

Another classification is by temperature range. Many aquarists maintain a tropical aquarium as these fish tend to be more colorful. However, the coldwater aquarium is also popular, which may include fish such as goldfish.

A saltwater aquarium.

Aquaria may be grouped by their species selection. The community tank is the most common type of aquarium kept today, where several non-aggressive species are housed peacefully together. In these aquaria, the aquarium fish, invertebrates, and plants probably do not originate from the same geographic region, but generally tolerate similar water conditions. Aggressive tanks, in contrast, house a limited number of species that can be aggressive toward other fish, or are able to withstand aggression well. Species or specimen tanks usually only house one fish species, along with plants, perhaps found in the fishes’ natural environment and decorations simulating a true ecosystem. This type is useful for fish that simply cannot be housed safely with other fish, such as the electric eel, as an extreme example. Some tanks of this sort are used simply to house adults for breeding.

Ecotype, ecotope, or biotope aquaria is another type based on species selection. In it, an aquarist attempts to simulate a specific ecosystem found in the natural world, bringing together fish, invertebrate species, and plants found only in that ecosystem in a tank with water conditions and decorations designed to simulate their natural environment. These ecotype aquaria might be considered the most sophisticated hobby aquaria; indeed, public aquaria use this approach in their exhibits whenever possible. This approach best simulates the experience of observing an aquarium’s inhabitants in the wild. Matching a tank to the environment at the source of fish usually serves as the healthiest possible artificial environment for the tank’s occupants.

Public aquaria

Most public aquariums feature a number of smaller aquaria, as well those greater in size than could be kept by home aquarists. The largest tanks hold millions of gallons of water and can house large species, including sharks or beluga whales. Dolphinariums are aquaria specifically for housing dolphins. Aquatic and semiaquatic animals, including otters and penguins, may also be kept by public aquariums. Public aquariums may also be included in larger establishments such as a marine mammal park or a marine park.

Virtual aquariums

A virtual aquarium is a computer program which uses 3D graphics to reproduce an aquarium on a personal computer. The swimming fish are rendered in real time, while the background of the tank is usually static. Objects on the floor of the tank may be mapped in simple planes so that the fish may appear to swim both in front and behind them, but a relatively simple 3D map of the general shape of such objects may be used to allow the light and ripples on the surface of the water to cast realistic shadows. Bubbles and water noises are common for virtual aquariums, which are often used as screensavers.

The number of each type of fish can usually be selected, often including other animals like starfish, jellyfish, seahorses, and even sea turtles. Most companies that produce virtual aquarium software also offer other types of fish for sale via Internet download. Other objects found in an aquarium can also be added and rearranged on some software, like treasure chests and giant clams that open and close with air bubbles, or a bobbing diver. There are also usually features that allow the user to tap on the glass or put food in the top, both of which the fish will react to. Some also have the ability to allow the user to edit fish and other objects to create new varieties.

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Aquatic play is play activity involving water. Aquatic play facilities are commonly installed in neighbourhoods, in the form of splash pads, “spraygrounds”, urban beaches, or other aquatic play equipment such as hydraulophones.

Splash pads and spraygrounds

A common form of aquatic play is the splash pad or sprayground, which appeals mainly to children.

Age-inclusive aquatic play

More recently, aquatic play features have been designed with a level of sophistication and intricacy that will appeal to people of all ages, including children as well as adults, the elderly, and persons with special needs.

Age-inclusive aquatic play appeals to young and old alike. Hydraulophones give aquatic play a level of sophistication and intricacy that actively engages the mind and body from even a very small quantity of water, as compared with other aquatic play devices that rely more on larger quantities of water.

The urban beach attempts to create this level of sophistication, by way of age-inclusive aquatic play devices such as the hydraulophone, a musical instrument that uses only a small amount of water in order to create a fun and playful space that engages both the mind and body.
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Architectural engineering, also known as Building Engineering, is the application of engineering principles and technology to building design and construction. Definitions of an architectural engineer may refer to:

An engineer in the structural, mechanical, electrical, construction or other engineering fields of building design and construction.

A licensed engineering professional in parts of the United States, where architectural engineering may include complete building design.

In informal contexts, and formally in some places, a professional synonymous with or similar to an architect. In some languages, “architect” is literally translated as “architectural engineer”.

Engineering for buildings

Structural

Structural engineering involves the analysis and design of physical objects such as buildings, bridges, equipment supports, towers and walls. Those concentrating on buildings are responsible for the structural performance of a large part of the built environment and are, sometimes, informally referred to as “building engineers”. Structural engineers require expertise in strength of materials and in the seismic design of structures covered by earthquake engineering. Architectural Engineers sometimes practice structural as one aspect of their designs; the structural discipline when practiced as a specialty works closely with architects and other engineering specialists.

Mechanical, Electrical and Plumbing (MEP)

Some Architectural Engineers perform MEP for their own building designs; in most cases, however, mechanical and electrical engineers are specialists, commonly referred to as “MEP” (mechanical, electrical and plumbing) when engaged in the building design fields. Also known as “Building services engineering” in the United Kingdom, Canada and Australia. Mechanical engineers design and oversee the heating ventilation and air conditioning (HVAC), plumbing, and rain gutter systems. Plumbing designers often include design specifications for simple active fire protection systems, but for more complicated projects, fire protection engineers are often separately retained. Electrical engineers are responsible for the building’s power distribution, telecommunication, fire alarm, signalization, lightning protection and control systems, as well as lighting systems.

The Architectural engineer (PE) in the United States

In many jurisdictions of the United States, the architectural engineer is a licensed engineering professional, usually a graduate of an architectural engineering university program preparing students to perform whole-building design in competition with architect-engineer teams; or for practice in one of structural, mechanical or electrical fields of building design, but with an appreciation of integrated architectural requirements.

Formal architectural engineering education, following the engineering model of earlier disciplines, developed in the late 1800s, and became widespread in the United States by the mid 1900s. With the establishment of a specific “architectural engineering” NCEES Professional Engineering registration examination in the 1990s, and first offering in April 2003, architectural engineering became recognized as a distinct engineering discipline in the United States. Architectural engineers are not entitled to practice architecture unless they are also licensed as architects.

The Architect as Architectural Engineer

In some countries architecture engineer, as a profession providing architectural services, is sometimes referred to as “architectural engineering”. In others, such as in Japan, the terms “architecture” and “building engineering” are used synonymously. The practice of architecture includes the planning, designing and oversight of a building’s construction.

In some languages, such as Korean and Arabic, “architect” is literally translated as “architectural engineer”. In some countries, an “architectural engineer” (such as the ingegnere edile in Italy) is entitled to practice architecture and is often referred to as an architect. These individuals are often also structural engineers. In other countries, such as Germany and Austria, architecture graduates receive an engineering degree (Dip-Ing).
Education

The architectural, structural, mechanical and electrical engineering branches each have well established educational requirements that are usually fulfilled by completion of a university program.

Architectural Engineering as a single integrated field of study

What differentiates Architectural Engineering as a separate and single, integrated field of study, compared to other engineering disciplines, is its multi-disciplined engineering approach. Through training in and appreciation of architecture, the field seeks integration of building systems within its overall building design. Architectural Engineering includes the design of building systems including Heating, ventilation and air conditioning (HVAC), plumbing, fire protection, electrical, lighting, transportation, and structural systems. In some university programs, students are required to concentrate on one of the systems; in others, they can receive a generalist Architectural or Building Engineering degree.

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The term architecture (from Greek αρχιτεκτονική, architektonike) can be used to mean a process, a profession or documentation.

As a process, architecture is the activity of designing and constructing buildings and other physical structures by a person or a machine, primarily to provide socially purposeful shelter. A wider definition often includes the design of the total built environment, from the macro level of how a building integrates with its surrounding man made landscape (see town planning, urban design, and landscape architecture) to the micro level of architectural or construction details and, sometimes, furniture. Wider still, architecture is the activity of designing any kind of system.

As a profession, architecture is the role of those persons or machines providing architectural services.

As documentation, usually based on drawings, architecture defines the structure and/or behavior of a building or any other kind of system that is to be or has been constructed.

Architects have as their primary object providing for the spatial and shelter needs of people in groups of some kind (families, schools, churches, businesses, etc.) by the creative organisation of materials and components in a land- or city-scape, dealing with mass, space, form, volume, texture, structure, light, shadow, materials, program, and pragmatic elements such as cost, construction limitations and technology, to achieve an end which is functional, economical, practical and often with artistic and aesthetic aspects. This distinguishes architecture from engineering design, which has as its primary object the creative manipulation of materials and forms using mathematical and scientific principles.

Separate from the design process, architecture is also experienced through the senses, which therefore gives rise to aural, visual, olfactory, and tactile architecture. As people move through a space, architecture is experienced as a time sequence. Even though our culture considers architecture to be a visual experience, the other senses play a role in how we experience both natural and built environments. Attitudes towards the senses depend on culture. The design process and the sensory experience of a space are distinctly separate views, each with its own language and assumptions.

Architectural works are perceived as cultural and political symbols and works of art. Historical civilizations are often known primarily through their architectural achievements. Such buildings as the pyramids of Egypt and the Roman Colosseum are cultural symbols, and are an important link in public consciousness, even when scholars have discovered much about a past civilization through other means. Cities, regions and cultures continue to identify themselves with (and are known by) their architectural monuments.

Etymology and application of the term

The word “architecture” comes from the Latin architura and that from Greek αρχιτέκτων (architectu), “master builder”, from the combination of αρχι- (archi-), “chief” or “leader” and τέκτων (tekton), a “builder” or “carpenter”. While the primary application of the word “architecture” pertains to the built environment, by extension, the term has come to denote the art and discipline of creating an actual (or inferring an implied or apparent) plan of any complex object or system. The term can be used to connote the implied architecture of mathematics or of abstract things such as music, the apparent architecture of natural things, such as geological formations or the structure of biological cells, or explicitly planned architectures of human-made things such as software, computers, enterprises, and databases, in addition to buildings. In every usage, an architecture may be seen as a subjective mapping from a human perspective (that of the user in the case of abstract or physical artifacts) to the elements or components of some kind of structure or system, which preserves the relationships among the elements or components.

Theory of Architecture

Historic treatises

The earliest written work on the subject of architecture is De architectura, by the Roman architect Vitruvius in the early 1st century CE. According to Vitruvius, a good building should satisfy the three principles of firmitatis utilitatis venustatis, which translates roughly as

Durability – it should stand up robustly and remain in good condition.
Utility – it should be useful and function well for the people using it.
Beauty – it should delight people and raise their spirits.

According to Vitruvius, the architect should strive to fulfill each of these three attributes as well as possible.

Leone Battista Alberti, who elaborates on the ideas of Vitruvius in his treatise, De Re Aedificatoria, saw beauty primarily as a matter of proportion, although ornament also played a part. For Alberti, the rules of proportion were those that governed the idealised human figure, the Golden Mean. The most important aspect of beauty was therefore an inherent part of an object, rather than something applied superficially; and was based on universal, recognisable truths. The notion of style in the arts was not developed until the 16th century, with the writing of Vasari. The treatises, by the 18th century, had been translated into Italian, French, Spanish and English.

In the early nineteenth century, Augustus Welby Northmore Pugin wrote Contrasts (1836) that, as the titled suggested, contrasted the modern, industrial world, which he disparaged, with an idealized image of neo-medieval world. Gothic architecture, Pugin believed, was the only “true Christian form of architecture.”

The 19th century English art critic, John Ruskin, in his Seven Lamps of Architecture, published 1849, was much narrower in his view of what constituted architecture. Architecture was the “art which so disposes and adorns the edifices raised by men … that the sight of them” contributes “to his mental health, power, and pleasure”. For Ruskin, the aesthetic was of overriding significance. His work goes on to state that a building is not truly a work of architecture unless it is in some way “adorned”. For Ruskin, a well-constructed, well-proportioned, functional building needed string courses or rustication, at the very least.

On the difference between the ideals of “architecture” and mere “construction”, the renowned 20th C. architect Le Corbusier wrote: “You employ stone, wood, and concrete, and with these materials you build houses and palaces: that is construction. Ingenuity is at work. But suddenly you touch my heart, you do me good. I am happy and I say: This is beautiful. That is Architecture”.

Modern concepts of architecture

The great 19th century architect of skyscrapers, Louis Sullivan, promoted an overriding precept to architectural design: “Form follows function”.

While the notion that structural and aesthetic considerations should be entirely subject to functionality was met with both popularity and skepticism, it had the effect of introducing the concept of “function” in place of Vitruvius “utility”. “Function” came to be seen as encompassing all criteria of the use, perception and enjoyment of a building, not only practical but also aesthetic, psychological and cultural.

Nunzia Rondanini stated, “Through its aesthetic dimension architecture goes beyond the functional aspects that it has in common with other human sciences. Through its own particular way of expressing values, architecture can stimulate and influence social life without presuming that, in and of itself, it will promote social development. To restrict the meaning of (architectural) formalism to art for art’s sake is not only reactionary; it can also be a purposeless quest for perfection or originality which degrades form into a mere instrumentality”.

Among the philosophies that have influenced modern architects and their approach to building design are rationalism, empiricism, structuralism, poststructuralism, and phenomenology.

In the late 20th century a new concept was added to those included in the compass of both structure and function, the consideration of sustainability. To satisfy the modern ethos a building should be constructed in a manner which is environmentally friendly in terms of the production of its materials, its impact upon the natural and built environment of its surrounding area and the demands that it makes upon non-sustainable power sources for heating, cooling, water and waste management and lighting.

History

Origins and the ancient world

Architecture first evolved out of the dynamics between needs (shelter, security, worship, etc.) and means (available building materials and attendant skills). As human cultures developed and knowledge began to be formalized through oral traditions and practices, architecture became a craft. Here there is first a process of trial and error, and later improvisation or replication of a successful trial. What is termed Vernacular architecture continues to be produced in many parts of the world. Indeed, vernacular buildings make up most of the built world that people experience every day.

Early human settlements were mostly rural. Due to a surplus in production the economy began to expand resulting in urbanization thus creating urban areas which grew and evolved very rapidly in some cases, such as that of Çatal Huyuk in Anatolia and Mohenjo Daro in Pakistan. In many ancient civilizations, like the Egyptians’ and Mesopotamians’, architecture and urbanism reflected the constant engagement with the divine and the supernatural, while in other ancient cultures such as Persia architecture and urban planning was used to exemplify the power of the state.

The architecture and urbanism of the Classical civilizations such as the Greek and the Roman evolved from civic ideals rather than religious or empirical ones and new building types emerged. Architectural styles developed.

Texts on architecture began to be written in the Classical period. These became canons to be followed in important works, especially religious architecture. Some examples of canons are found in the writings of Vitruvius, the Kao Gong Ji of ancient China and Vaastu Shastra of ancient India.

The architecture of different parts of Asia developed along different lines to that of Europe, Buddhist, Hindu and Sikh architecture each having different characteristics. Buddhist architecture, in particular, showed great regional diversity. In many Asian countries a pantheistic religion led to architectural forms that were designed specifically to enhance the natural landscape.

The Medieval builder

Islamic architecture began in the 7th century CE, developing from the architectural forms of the ancient Middle East but developing features to suit the religious and social needs of the society. Examples can be found throughout the Middle East, North Africa and Spain, and were to become a significant stylistic influence on European architecture during the Medieval period.

In Europe, in both the Classical and Medieval periods, buildings were not attributed to specific individuals and the names of the architects frequently unknown, despite the vast scale of the many religious buildings extant from this period. During the Medieval period guilds were formed by craftsmen to organise their trade and written contracts have survived, particularly in relation to ecclesiastical buildings. The role of architect was usually one with master builder, except in the case where a cleric, such as the Abbot Suger at Saint Denis, Paris, provided the design. Over time the complexity of buildings and their types increased. General civil construction such as roads and bridges began to be built. Many new building types such as schools, hospitals, and recreational facilities emerged.

Renaissance and the architect

With the Renaissance and its emphasis on the individual and humanity rather than religion, and with all its attendant progress and achievements, a new chapter began. Buildings were ascribed to specific architects – Brunelleschi, Alberti, Michelangelo, Palladio – and the cult of the individual had begun. But there was no dividing line between artist, architect and engineer, or any of the related vocations. At this stage, it was still possible for an artist to design a bridge as the level of structural calculations involved was within the scope of the generalist.

With the emerging knowledge in scientific fields and the rise of new materials and technology, architecture and engineering began to separate, and the architect began to lose ground on some technical aspects of building design. He therefore concentrated on aesthetics and the humanist aspects.

There was also the rise of the “gentleman architect” who usually dealt with wealthy clients and concentrated predominantly on visual qualities derived usually from historical prototypes, typified by the many country houses of Great Britain that were created in the Neo Gothic or Scottish Baronial styles.

Formal architectural training, in the 19th century, at, for example Ecole des Beaux Arts in France, gave much emphasis to the production of beautiful drawings and little to context and feasibility. Effective architects generally received their training in the offices of other architects, graduating to the role from draughtsmen or clerks.

Meanwhile, the Industrial Revolution laid open the door for mass production and consumption. Aesthetics became a criterion for the middle class as ornamented products, once within the province of expensive craftsmanship, became cheaper under machine production. Vernacular architecture became increasingly ornamental. House builders could access current architectural design in their work by combining features found in pattern books and architectural journals.

Modernism and reaction of architecture

The dissatisfaction with such a general situation at the turn of the twentieth century gave rise to many new lines of thought that served as precursors to Modern Architecture. Notable among these is the Deutscher Werkbund, formed in 1907 to produce better quality machine made objects. The rise of the profession of industrial design is usually placed here.

Following this lead, the Bauhaus school, founded in Germany in 1919, consciously rejected history and looked at architecture as a synthesis of art, craft, and technology.

When Modern architecture was first practiced, it was an avant-garde movement with moral, philosophical, and aesthetic underpinnings. Immediately after World War I, pioneering modernist architects sought to develop a completely new style appropriate for a new post-war social and economic order, focused on meeting the needs of the middle and working classes. They rejected the architectural practice of the academic refinement of historical styles which served the rapidly declining aristocratic order.

The approach of the Modernist architects was to reduce buildings to pure forms, removing historical references and ornament in favor of functionalist details. Buildings that displayed their construction and structure, exposing steel beams and concrete surfaces instead of hiding them behind traditional forms, were seen as beautiful in their own right. Architects such as Mies van der Rohe worked to create beauty based on the inherent qualities of building materials and modern construction techniques, trading traditional historic forms for simplified geometric forms, celebrating the new means and methods made possible by the Industrial Revolution.

Many architects resisted Modernism, finding it devoid of the decorative richness of ornamented styles. As the founders of the International Style lost influence in the late 1970s, Postmodernism developed as a reaction against the austerity of Modernism. Robert Venturi‘s contention that a “decorated shed” (an ordinary building which is functionally designed inside and embellished on the outside) was better than a “duck” (a building in which the whole form and its function are tied together) gives an idea of this approach.

Architecture today

Part of the architectural profession, and also some non-architects, responded to Modernism and Postmodernism by going to what they considered the root of the problem. They felt that architecture was not a personal philosophical or aesthetic pursuit by individualists; rather it had to consider everyday needs of people and use technology to give a livable environment. The Design Methodology Movement involving people such as Christopher Alexander started searching for more people-oriented designs. Extensive studies on areas such as behavioral, environmental, and social sciences were done and started informing the design process.

As the complexity of buildings began to increase (in terms of structural systems, services, energy and technologies), architecture started becoming more multi-disciplinary. Architecture today usually requires a team of specialist professionals, with the architect being one of many, although usually the team leader.

During the last two decades of the twentieth century and into the new millennium, the field of architecture saw the rise of specializations by project type, technological expertise or project delivery methods. In addition, there has been an increased separation of the ‘design’ architect from the ‘project’ architect.

Moving the issues of environmental sustainability into the mainstream is a significant development in the architecture profession. Sustainability in architecture was pioneered in the 1970s by architects such as Ian McHarg in the US and Brenda and Robert Vale in the UK and New Zealand. There has been an acceleration in the number of buildings which seek to meet green building sustainable design principles.

It is now expected that architects will integrate sustainable principles into their projects.

The American Institute of Architects acknowledges that half of today’s global warming greenhouse gas emissions come from buildings – more than transportation or industry. AIA states that immediate action by the building sector is essential to avoid hazardous man-made climate change. They have an “Architecture 2030” plan to reduce new building energy consumption by 90% in 2030, and net zero greenhouse gas emissions by 2035. Passive solar building design has been demonstrating essential elements of 70% to 90% energy consumption reduction in roughly 300,000 buildings since the 1978 U.S. Solar Energy Tax Incentives. Many of these energy efficiency features can be added at little-or-no additional net cost during construction. Newer zero energy buildings have reduced net annual energy consumption, producing excess energy and selling it back to the power company during moderate months. The demand for zero energy buildings is growing rapidly – subsidies are available for this type of building – The supply of zero energy buildings has fallen far short of current demand. Off-the-grid buildings are now demonstrating total self sufficiency. The 2009 Bank of America Tower (New York) has many innovative energy features.

President George W. Bush’s 2006 Solar America Initiative expects architects and builders to design and construct new zero energy buildings by 2015. The U.S. Energy Independence and Security Act of 2007 funded the new Solar Air Conditioning Research and Development Program, to develop technology innovations and mass production economies of scale. The U.S. Department of Energy and the National Renewable Energy Laboratory (NREL) also sponsor The Solar Decathlon, an international competition among universities for solar energy alternatives when it comes to houses. The houses built by the team are exhibited on the National Mall for the public to experience.

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Artificial waves are man-made waves usually created on a specially designed surface or in a pool.

Artificial waves are created in one or two ways. First, if the wave is created on a designed surface, water is shot over the surface at a high speed to create a wave. These waves are ridden with a short board about the length of a wakeboard where the rider is strapped on to the board to prevent the board from flying out under the rider’s feet. The second method an artificial wave is created is in a wave pool. Much like sliding back and forth in a bathtub, water is pushed out of an opening with enough force to create a wave-like shape. Riders can ride this type of wave on a regular surfboard.

Dr Peter Killen was the first to develop a continuously breaking, oblique, stationary wave for the study of wave riding. The work was published in the Journal of Fluid Mechanics in 1976.

Artificial reefs can also be placed into natural wave environments to enhance the quality of the incoming breaking wave for surfing. Wave focusing areas can build up wave power and height prior to breaking and breaking surfaces then trip the wave up to make it break, the surfing surface then carries the breaking wave along an angle that maximises its value for surfing.

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Canyoning (known as canyoneering in the U.S.) is traveling in canyons using a variety of techniques that may include walking, scrambling, climbing, jumping, abseiling, and/or swimming.

Although hiking down a canyon that is non-technical (canyon hiking) is often referred to as canyoneering, the terms canyoning and canyoneering are more often associated with technical descents — those that require rappels (abseils) and ropework, technical climbing or down-climbing, technical jumps, and/or technical swims.

Canyoning is frequently done in remote and rugged settings and often requires navigational, route-finding and other wilderness travel skills.

Canyons that are ideal for canyoning are often cut into the bedrock stone, forming narrow gorges with numerous drops, beautifully sculpted walls, and sometimes spectacular waterfalls. Most canyons are cut into limestone, sandstone, granite or basalt, though other rock types are found. Canyons can be very easy or extremely difficult, though emphasis in the sport is usually on aesthetics and fun rather than pure difficulty. A wide variety of canyoning routes are found throughout the world, and canyoning is enjoyed by people of all ages and skill levels.

Canyoning gear includes climbing hardware, static ropes, helmets, wetsuits, and specially designed shoes, packs, and rope bags. While canyoners have used and adapted climbing, hiking, and river running gear for years, more and more specialized gear is invented and manufactured as canyoning popularity increases.

Canyoning around the world

In most parts of the world canyoning is done in mountain canyons with flowing water. Countries with established canyoning include: Portugal, Australia, New Zealand, Spain, France, Italy, Montenegro, Switzerland, Germany, Austria, Reunion Island, Greece, Jordan, Canada, Mexico, Costa Rica, Brazil, Ecuador, Japan, Croatia, Slovenia, Turkey, Israel, Mauritius and the United States. Many canyons in South Africa require jumping or scrambling which is called Kloofing. Even in Hong Kong, where there are numerous stream gorges, a similar activity called stream or river trekking is popular. In Japan and Taiwan it’s called river tracing and typically involves traveling upstream.

In the United States, descending mountain canyons with flowing water is sometimes referred to as canyoning, although the term “canyoneering” is more common. Most canyoneering in the United States occurs in the many slot canyons carved in the sandstone found throughout the Colorado Plateau. Outside of the Colorado Plateau, numerous canyoneering opportunities are found in the San Gabriel, Sierra Nevada, Cascade, and Rocky Mountain ranges.

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In the fields of architecture and civil engineering, construction is a process that consists of the building or assembling of infrastructure. Far from being a single activity, large scale construction is a feat of multitasking. Normally the job is managed by the project manager and supervised by the construction manager, design engineer, construction engineer or project architect.

For the successful execution of a project, effective planning is essential. Those involved with the design and execution of the infrastructure in question must consider the environmental impact of the job, the successful scheduling, budgeting, site safety, availability of materials, logistics, inconvenience to the public caused by construction delays, preparing tender documents, etc.

Types of construction projects

In general, there are three types of construction:

– Building construction
– Heavy/civil construction
– Industrial construction

Each type of construction project requires a unique team to plan, design, construct, and maintain the project.

Building construction

Building construction for several apartment blocks. The blue material is insulation cladding, which will be covered later.

Building construction is the process of adding structure to real property. The vast majority of building construction projects are small renovations, such as addition of a room, or renovation of a bathroom. Often, the owner of the property acts as laborer, paymaster, and design team for the entire project. However, all building construction projects include some elements in common – design, financial, and legal considerations. Many projects of varying sizes reach undesirable end results, such as structural collapse, cost overruns, and/or litigation reason, those with experience in the field make detailed plans and maintain careful oversight during the project to ensure a positive outcome.

Building construction is procured privately or publicly utilizing various delivery methodologies, including hard bid, negotiated price, traditional, management contracting, construction management-at-risk, design & build and design-build bridging.

Residential construction practices, technologies, and resources must conform to local building authority regulations and codes of practice. Materials readily available in the area generally dictate the construction materials used (e.g. brick versus stone, versus timber). Cost of construction on a per square metre (or per square foot) basis for houses can vary dramatically based on site conditions, local regulations, economies of scale (custom designed homes are always more expensive to build) and the availability of skilled tradespeople. As residential (as well as all other types of construction) can generate a lot of waste, careful planning again is needed here.

The most popular method of residential construction in the United States is wood framed construction. As efficiency codes have come into effect in recent years, new construction technologies and methods have emerged. University Construction Management departments are on the cutting edge of the newest methods of construction intended to improve efficiency, performance and reduce construction waste.

Heavy/civil construction

Heavy/Civil construction is the process of adding infrastructure to our built environment. Owners of these projects are usually government agencies, either at the national or local level. As in building construction, heavy/civil construction has design, financial, and legal considerations, however these projects are not usually undertaken for-profit, but to service the public interest. However, heavy/civil construction projects are also undertaken by large private corporations, including, among others, golf courses, harbors, power companies, railroads, and mines, who undertake the construction of access roads, dams, railroads, general site grading, and massive earthwork projects. As in building construction, the owner will assemble a team to create an overall plan to ensure that the goals of the project are met.

Industrial construction

Industrial construction, though a relatively small part of the entire construction industry, is a very important component. Owners of these projects are usually large, for-profit, industrial corporations. These corporations can be found in such industries as medicine, petroleum, chemical, power generation, manufacturing, etc. Processes in these industries require highly specialized expertise in planning, design, and construction. As in building and heavy/highway construction, this type of construction requires a team of individuals to ensure a successful project.

Construction Processes

Design team

In the modern industrialized world, construction usually involves the translation of paper or computer based designs into reality. A formal design team may be assembled to plan the physical proceedings, and to integrate those proceedings with the other parts. The design usually consists of drawings and specifications, usually prepared by a design team including the client architects, interior designers, surveyors, civil engineers, cost engineers (or quantity surveyors), mechanical engineers, electrical engineers, structural engineers, and fire protection engineers. The design team is most commonly employed by (i.e. in contract with) the property owner. Under this system, once the design is completed by the design team, a number of construction companies or construction management companies may then be asked to make a bid for the work, either based directly on the design, or on the basis of drawings and a bill of quantities provided by a quantity surveyor. Following evaluation of bids, the owner will typically award a contract to the lowest responsible bidder.

The modern trend in design is toward integration of previously separated specialties, especially among large firms. In the past, architects, interior designers, engineers, developers, construction managers, and general contractors were more likely to be entirely separate companies, even in the larger firms. Presently, a firm that is nominally an “architecture” or “construction management” firm may have experts from all related fields as employees, or to have an associated company that provides each necessary skill. Thus, each such firm may offer itself as “one-stop shopping” for a construction project, from beginning to end. This is designated as a “design Build” contract where the contractor is given a performance specification, and must undertake the project from design to construction, while adhering to the performance specifications.

Several project structures can assist the owner in this integration, including design-build, partnering, and construction management. In general, each of these project structures allows the owner to integrate the services of architects, interior designers, engineers, and constructors throughout design and construction. In response, many companies are growing beyond traditional offerings of design or construction services alone, and are placing more emphasis on establishing relationships with other necessary participants through the design-build process.

The increasing complexity of construction projects creates the need for design professionals trained in all phases of the project’s life-cycle and develop an appreciation of the building as an advanced technological system requiring close integration of many sub-systems and their individual components, including sustainability. Building engineering is an emerging discipline that attempts to meet this new challenge.

Financial advisors

Many construction projects suffer from preventable financial problems. Underbids ask for too little money to complete the project. Cash flow problems exist when the present amount of funding cannot cover the current costs for labour and materials, and because they are a matter of having sufficient funds at a specific time, can arise even when the overall total is enough. Fraud is a problem in many fields, but is notoriously prevalent in the construction field. Financial planning for the project is intended to ensure that a solid plan, with adequate safeguards and contingency plans, is in place before the project is started, and is required to ensure that the plan is properly executed over the life of the project.

Mortgage bankers, accountants, and cost engineers are likely participants in creating an overall plan for the financial management of the building construction project. The presence of the mortgage banker is highly likely even in relatively small projects, since the owner’s equity in the property is the most obvious source of funding for a building project. Accountants act to study the expected monetary flow over the life of the project, and to monitor the payouts throughout the process. Cost engineers apply expertise to relate the work and materials involved to a proper valuation. Cost overruns with government projects have occurred when the contractor was able to identify change orders or changes in the project resulting in large increases in cost, which are not subject to competition by other firm as they have already been eliminated from consideration after the initial bid.

Large projects can involve highly complex financial plans. As portions of a project are completed, they may be sold, supplanting one lender or owner for another, while the logistical requirements of having the right trades and materials available for each stage of the building construction project carries forward. In many English speaking countries, but not the United States, projects typically use quantity surveyors.

Legal considerations

A construction project must fit into the legal framework governing the property. These include governmental regulations on the use of property, and obligations that are created in the process of construction.

The project must adhere to zoning and building code requirements. Constructing a project that fails to adhere to codes will not benefit the owner. Some legal requirements come from malum in se considerations, or the desire to prevent things that are indisputably bad – bridge collapses or explosions. Other legal requirements come from malum prohibitum considerations, or things that are a matter of custom or expectation, such as isolating businesses to a business district and residences to a residential district. An attorney may seek changes or exemptions in the law governing the land where the building will be built, either by arguing that a rule is inapplicable (the bridge design won’t collapse), or that the custom is no longer needed (acceptance of live-work spaces has grown in the community).

A construction project is a complex net of contracts and other legal obligations, each of which must be carefully considered. A contract is the exchange of a set of obligations between two or more parties, but it is not so simple a matter as trying to get the other side to agree to as much as possible in exchange for as little as possible. The time element in construction means that a delay costs money, and in cases of bottlenecks, the delay can be extremely expensive. Thus, the contracts must be designed to ensure that each side is capable of performing the obligations set out. Contracts that set out clear expectations and clear paths to accomplishing those expectations are far more likely to result in the project flowing smoothly, whereas poorly drafted contracts lead to confusion and collapse.

Legal advisors in the beginning of a construction project seek to identify ambiguities and other potential sources of trouble in the contract structure, and to present options for preventing problems. Throughout the process of the project, they work to avoid and resolve conflicts that arise. In each case, the lawyer facilitates an exchange of obligations that matches the reality of the project.

Interaction of expertise

Design, finance, and legal aspects overlap and interrelate. The design must be not only structurally sound and appropriate for the use and location, but must also be financially possible to build, and legal to use. The financial structure must accommodate the need for building the design provided, and must pay amounts that are legally owed. The legal structure must integrate the design into the surrounding legal framework, and enforces the financial consequences of the construction process.

Procurement

Procurement describes the merging of activities undertaken by the client to obtain a building. There are many different methods of construction procurement; however the three most common types of procurement are:

Traditional (Design-bid-build)
Design and Build
Management Contracting

Traditional

This the most common method of construction procurement and is well established and recognized. In this arrangement, the architect or engineer acts as the project coordinator. His or her role is to design the works, prepare the specifications and produce construction drawings, administer the contract, tender the works, and manage the works from inception to completion. There are direct contractual links between the architect’s client and the main contractor. Any subcontractor will have a direct contractual relationship with the main contractor.

Design and build
This approach has become more common in recent years and includes an entire completed package, including fixtures, fittings and equipment where necessary, to produce a completed fully functional building. In some cases, the Design and Build (D & B) package can also include finding the site, arranging funding and applying for all necessary statutory consents.

The owner produces a list of requirements for a project, giving an overall view of the project’s goals. Several D&B contractors present different ideas about how to accomplish these goals. The owner selects the ideas he likes best and hires the appropriate contractor. Often, it is not just one contractor, but a consortium of several contractors working together. Once a contractor (or a consortium/consortia) has been hired, they begin building the first phase of the project. As they build phase 1, they design phase 2. This is in contrast to a design-bid-build contract, where the project is completely designed by the owner, then bid on, then completed.

Kent Hansen, director of engineering for the National Asphalt Pavement Association (NAPA), pointed out that state departments of transportation (DOTs) usually use design build contracts as a way of getting projects done when states don’t have the resources. In DOTs, design build contracts are usually used for very large projects.

Management procurement systems

In this arrangement the client plays an active role in the procurement system by entering into separate contracts with the designer (architect or engineer), the construction manager, and individual trade contractors. The client takes on the contractual role, while the construction or project manager provides the active role of managing the separate trade contracts, and ensuring that they all work smoothly and effectively together.

Management procurement systems are often used to speed up the procurement processes, allow the client greater flexibility in design variation throughout the contract, the ability to appoint individual work contractors, separate contractual responsibility on each individual throughout the contract, and to provide greater client control.

Authority having jurisdiction

In construction, the authority having jurisdiction (AHJ) is the governmental agency or sub-agency which regulates the construction process. In most cases, this is the municipality in which the building is located. However, construction performed for supra-municipal authorities are usually regulated directly by the owning authority, which becomes the AHJ.

During the planning of a building, the zoning and planning boards of the AHJ will review the overall compliance of the proposed building with the municipal General Plan and zoning regulations. Once the proposed building has been approved, detailed civil, architectural, and structural plans must be submitted to the municipal building department (and sometimes the public works department) to determine compliance with the building code and sometimes for fit with existing infrastructure. Often, the municipal fire department will review the plans for compliance with fire-safety ordinances and regulations.

Before the foundation can be dug, contractors are typically required to notify utility companies, either directly or through a company such as Dig Safe to ensure that underground utility lines can be marked. This lessens the likelihood of damage to the existing electrical, water, sewage, phone, and cable facilities, which could cause outages and potentially hazardous situations. During the construction of a building, the municipal building inspector inspects the building periodically to ensure that the construction adheres to the approved plans and the local building code. Once construction is complete and a final inspection has been passed, an occupancy permit may be issued.
An operating building must remain in compliance with the fire code. The fire code is enforced by the local fire department.

Changes made to a building that affect safety, including its use, expansion, structural integrity, and fire protection items, usually require approval of the AHJ for review concerning the building code.

Routes into construction careers

There are several routes to the different careers within the construction industry. Craft industries offer jobs where employees train while they work through apprenticeships and other training schemes. Another way, where many construction staff have found success, is through recruitment agencies.

Technical occupations in the UK require GCSE qualifications or vocational equivalents, either initially or through on the job apprenticeship training. One example is that of Quantity Surveying. Quantity Surveyors are effectively cost managers within the construction industry and may be: (1) employed by Chartered Surveyor practices (referred to often as “PQS” derived from the term Private Quantity Surveyor) who normally represent the client’s interest and liaise with the Architect on the client’s team, preparing cost plans, preparing tender documentation, giving cost advice on variations, preparing monthly valuation payments to the contractor, agreeing the final account with the contractor, generally looking after the client’s interests (although the role can be referred to within some standard forms of contract as being a neutral role to value ‘the’ costs of the project), in practice it tends to be looking after the client’s interests primarily; or (2) employed by Main Contractors, in which role they manage the contractor’s costs, place subcontract orders, make payments to subcontractors, claim monthly valuations from the client’s surveyor (Private QS or “PQS”), cost manage variations, prepare internal cost reports to senior management and directors, generally managing the project commercially and protect the contractor’s interests contractually. Contractual aspects such as delays and extensions of time issues are also within the remit of the Quantity Surveyor (QS); or (3) employed by Subcontractors, in which role they carry out a similar function to Main Contractor’s QS’s. The main difference is that they are normally submitting monthly valuation claims for payment to the Main Contractor, whereas the Manin Contractor claims from the client’s Surveyor (usually a Chartered Surveyor practice or Private QS “PQS”). Large subcontractors may also employ sub-subcontractors, thereby making the QS role similar in the cost management role, including placing sub-contract orders (to sub-subcontractors), valuing and claiming variations, preparing cost reports to senior management, etc; or (4) employed by Local Authorities (local Councils, etc), whereby the role is broadly similar to that of private practice surveyors in cost managing project from the funding client’s perspective (in this case the Local Authority council within which they are employed), dealing usually with main contractors; or (5) employed by Developers; whereby the role may be a mixture of the role of a client’s surveyor (the funding client being the developer in this case) mixed with that of a main contractor in possibly employing package sub-contractors directly Other information: The most recognised body for surveyors in construction is the Royal Institution of Chartered Surveyors (the ‘RICS’). It is more common for a private practice surveyor or local authority employed surveyor to be a member of the RICS, though RICS qualified surveyors do work within main contractors and sub-contractors (the writer of this Quantity Surveyor segment qualified RICS within private practice working on the client’s side, then migrated over to work for a large sub-contractor. Such cross-overs are quite common between client’s side and contracting). Quantity Surveying offers a great diversity of roles and in career path, working on a variety of projects and within different areas and facets of the construction industry. The qualification of “Chartered Quantity Surveyor” has been superseded as the RICS rules have replaced this with simply “Chartered Surveyor” (except those existing Chartered QS’s who registered to keep the Chartered QS title by a date now passed), and Chartered Quantity Surveyor practices have now largely adopted the title of “Construction Cost Consultants” and having the right to call themselves simply “Chartered Surveyors” – though still often referred to in the UK construction industry as “PQS’s”. It is also possible for Construction Cost Consultant practices to be occasionally employed by local authorities, contractors or subcontractors, on a particular construction project although not if they are already employed as surveyors for the same construction project.

As well as the role of Quantity Surveyor, other professions within the UK construction industry are for example: Architect, Engineer, Project Manager, Planner, Safety Officer. These roles may be in ‘Building’ (buildings such as Offices, Shopping Centres, Housing); or ‘Civil Engineering’ (structures such as Bridges, Dams, Motorways/Roads/Highways, Harbours/Ferry Terminals). While projects such as construction of new Power Stations or Naval Bases may comprise a combination of both ‘building’ and ‘civil engineering’.

Graduate roles in the construction industry are filled by people with at least a foundation degree in subjects such as civil engineering, construction engineering, architecture, building science and construction management. Graduates often receive specialized positions and gain qualifications such as chartered status.

History

The first buildings were huts and shelters, constructed by hand or with simple tools. As cities grew during the bronze age, a class of professional craftsmen like bricklayers and carpenters appeared. Occasionally, slaves were used for construction work. In the middle ages, these were organized into guilds. In the 19th century, steam-powered machinery appeared, and later diesel- and electric powered vehicles such as cranes, excavators and bulldozers., excavators and bulldozers.

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A dolphinarium is an aquarium for dolphins. The dolphins are usually kept in a large pool, though occasionally they may be kept in pens in the open sea, either for research or for public performances.

Some dolphinariums consist of one pool where dolphins perform for the public, others have expanded into much larger parks, keeping other marine animals and having other attractions. These larger parks are often not considered to be dolphinariums themselves, but marine mammal parks or theme parks that include a dolphinarium. A dolphinarium can also be part of a zoo.

History

Though cetaceans have been held in captivity in both North America and Europe since the 1860s, the first being a pair of Beluga Whales in the New York museum, dolphins were first kept for paid entertainment in the Marine Studios dolphinarium founded in 1938 in St. Augustine, Florida. It was here that it was discovered that dolphins could be trained to perform tricks. Recognizing the success of Marine Studios, more dolphinariums keeping dolphins for entertainment followed. In the 1960s, keeping dolphins in zoos and aquariums for entertainment purposes became increased in popularity after the 1963 Flipper movie and subsequent Flipper television series. In 1966 , the first dolphin was exported to Europe. In these early days, dolphinariums could grow quickly due to a lack of legislation and lack of concern for animal welfare. New legislation, most notably the 1972 Marine Mammal Protection Act in the United States, combined with a more critical view on animal welfare forced many dolphinariums around the world to close. As an example, during the early 1970s there were at least 36 dolphinariums and travelling dolphin shows in the United Kingdom, none of which still exist today, the last dolphinarium in the UK having closed its doors in 1993.

Design

A common dolphinarium design for public performances consists of stands for the public around a semi-circular pool, sometimes with glass walls which allow underwater viewing, and a platform in the middle from which the trainers direct and present the show.

The water in the pools has to be constantly filtered to keep it clean for the spectators and the dolphins, and the temperature and composition of the water has to be controlled to match the conditions dolphins experience in the wild. To give an indication of pool sizes, the European Association for Aquatic Mammals recommends that a pool for five dolphins should have a surface area of 275 m² (2960 ft²) plus an additional 75 m² (810 ft²) for every additional animal, have a depth of 3.5 m (11.5 ft) for at least the minimum surface area and have a water volume of at least 1000 m³ (35300 ft³) with an additional 200 m³ (7060 ft³) for every additional animal. If two of these three conditions are met and the third is not more than 10% below standard, the EAAM considers the pool size to be acceptable.

Animals

Species

Various species of dolphins are kept in captivity and also several other small whale species such as Harbour Porpoises, Finless Porpoises and Belugas, though in those cases the word dolphinarium may not be fitting as these are not true dolphins. Bottlenose Dolphins are the most common species of dolphin kept in dolphinariums: they are relatively easy to train, have a long lifespan in captivity and a friendly appearance. Hundreds if not thousands of Bottlenose Dolphins live in captivity across the world, though exact numbers are hard to give. Orcas are well known for their performances in shows, but the number of Orcas kept in captivity is very small especially when compared to the number of bottlenose dolphins, with only 48 captive Orcas being known as of 2007. Of all Orcas kept in captivity, the majority are located in the various SeaWorld parks in the United States. Other species kept in captivity are Spotted Dolphins, False Killer Whales and Common Dolphins, Commerson’s Dolphins, and Rough-toothed Dolphins, but all in much lower numbers than the Bottlenose Dolphin. Also kept, but in numbers of less than ten are Pilot Whales, Amazon River Dolphins, Risso’s Dolphins, Spinner Dolphins, and Tucuxi. Two unusual and very rare hybrid dolphins known as Wolphins are kept at the Sea Life Park in Hawaii, which are a cross between a Bottlenose Dolphin and a False Killer Whale. Also two Common/Bottlenose hybrids reside in captivity one at Discovery Cove and the other SeaWorld San Diego.

Trade and capture

In the early days, many bottlenose dolphins were wild caught off the coast of Florida where they are common. Though the Marine Mammal Protection Act, established in 1972, allows an exception for the collection of dolphins for public display and research purposes providing a permit is obtained, Bottlenose dolphins have not been captured in American waters since 1989. In most Western countries, breeding programmes have been set up to provide the dolphinariums with new animals. To achieve a sufficient birth rate and to prevent inbreeding, artificial insemination (AI) is occasionally used. The use of AI also allows dolphinariums to increase the genetic diversity of their population without having to bring in any dolphins from other facilities.

Live dolphins are still traded however. A live Bottlenose Dolphin is estimated to cost between a few thousand and several tens of thousands of US dollars, depending on age, condition and prior training. The trade of dolphins is regulated by CITES. Cuba has also been an exporter of dolphins in recent years, this being organised by the Acuario Nacional de Cuba. In recent years, the Solomon Islands have also allowed the collection and export of dolphins for public display facilities. A 2005 law banned the export of dolphins, however this ban has been seemingly overturned when in 2007 some 28 dolphins were shipped to Dubai. Some, mainly Japanese, dolphinariums obtain their dolphins from local drive hunts, though several other countries in Asia also import dolphins from Japan. Several American dolphinariums have also done so in the past, however not since 1993 when the US National Marine Fisheries Service refused a permit for Marine World Africa USA to import four False Killer Whales caught in a Japanese drive hunt. Members of the Alliance of Marine Mammal Parks and Aquariums, a US-based organization whose members include many of the captive dolphin facilities in the US as well as facilities around the world, now officially oppose the acquisition of animals from the Japanese drive fisheries.

Criticism

Though animal welfare is perceived to have improved significantly over the last few decades, many animal rights and welfare groups such as the WSPA still consider keeping dolphins at dolphinariums a form of animal abuse. The main arguments are that dolphins do not have enough freedom of movement in pools, regardless of pool size, (in the wild, dolphins swim hundreds of miles every day) and do not get enough stimulation. Dolphins often show repetitive behavior in captivity and sometimes become aggressive towards other animals or people: there have been a number of animal and human fatalities recorded, including that of at least one trainer. In some cases, the behavior of dolphins in captivity also results in their own death.

The lifespan of dolphins in captivity is another subject of debate. Research has shown that Orcas indeed have a much lower survival rate in captivity; however, there is no significant difference between wild and captive survival rates for Bottlenose dolphins. This does not, however, reflect a global state of affairs: for example, Bottlenose dolphins in captive facilities in Jamaica suffer from extremely high mortality rates.

In response to criticism, dolphinariums stress that every effort is being made to ensure the well-being of the animals, who are being cared for with state-of-the-art medical technology (including some adapted from that used for humans). Many dolphinariums are also involved in research and education programs, assist in cases of beachings, and provide aid to sick or injured wild animals.

Captive dolphins are an increasingly popular choice of animal-assisted therapy for humans with psychological problems and developmental disabilities. For example, a 2005 study of 30 participants found that dolphin-assisted therapy was an effective treatment for mild to moderate depression. However, this study was criticized on several grounds: for example, it is not known whether dolphins are more effective than common pets. Reviews of this and other published dolphin-assisted therapy (DAT) studies have found important methodological flaws, leading reviewers to conclude that there is no compelling scientific evidence that DAT is a legitimate therapy, or that it affords any more than fleeting improvements in human mood.

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Engineering is the discipline and profession of applying technical and scientific knowledge and utilizing natural laws and physical resources in order to design and implement materials, structures, machines, devices, systems, and processes that safely realize a desired objective and meet specified criteria. The American Engineers’ Council for Professional Development (ECPD, the predecessor of ABET) has defined engineering as follows: “[T]he creative application of scientific principles to design or develop structures, machines, apparatus, or manufacturing processes, or works utilizing them singly or in combination; or to construct or operate the same with full cognizance of their design; or to forecast their behavior under specific operating conditions; all as respects an intended function, economics of operation and safety to life and property.”

One who practices engineering is called an engineer, and those licensed to do so may have more formal designations such as European Engineer, Professional Engineer, Chartered Engineer, or Incorporated Engineer. The broad discipline of engineering encompasses a range of more specialized subdisciplines, each with a more specific emphasis on certain fields of application and particular areas of technology.

History

The Watt steam engine, a major driver in the industrial revolution, underscores the importance of engineering in modern history. This model is on display at the main building of the ETSIIM in Madrid, Spain.

The concept of engineering has existed since ancient times as humans devised fundamental inventions such as the pulley, lever, and wheel. Each of these inventions is consistent with the modern definition of engineering, exploiting basic mechanical principles to develop useful tools and objects.

The term engineering itself has a much more recent etymology, deriving from the word engineer, which itself dates back to 1325, when an engine’er (literally, one who operates an engine) originally referred to “a constructor of military engines.” In this context, now obsolete, an “engine” referred to a military machine, i. e., a mechanical contraption used in war (for example, a catapult). The word “engine” itself is of even older origin, ultimately deriving from the Latin ingenium (c. 1250), meaning “innate quality, especially mental power, hence a clever invention.”

Later, as the design of civilian structures such as bridges and buildings matured as a technical discipline, the term civil engineering entered the lexicon as a way to distinguish between those specializing in the construction of such non-military projects and those involved in the older discipline of military engineering (the original meaning of the word “engineering,” now largely obsolete, with notable exceptions that have survived to the present day such as military engineering corps, e. g., the U. S. Army Corps of Engineers).

Ancient Era

The Acropolis and the Parthenon in Greece, the Roman aqueducts, Via Appia and the Colosseum, the Hanging Gardens of Babylon, the Pharos of Alexandria, the pyramids in Egypt, Teotihuacán and the cities and pyramids of the Mayan, Inca and Aztec Empires, the Great Wall of China, among many others, stand as a testament to the ingenuity and skill of the ancient civil and military engineers.

The earliest civil engineer known by name is Imhotep. As one of the officials of the Pharaoh, Djosèr, he probably designed and supervised the construction of the Pyramid of Djoser (the Step Pyramid) at Saqqara in Egypt around 2630-2611 BC. He may also have been responsible for the first known use of columns in architecture.

Ancient Greece developed machines in both in the civilian and military domains. The Antikythera mechanism, the earliest known model of a mechanical computer in history, and the mechanical inventions of Archimedes are examples of early mechanical engineering. Some of Archimedes’ inventions as well as the Antikythera mechanism required sophisticated knowledge of differential gearing or epicyclic gearing, two key principles in machine theory that helped design the gear trains of the Industrial revolution and are still widely used today in diverse fields such as robotics and automotive engineering.

Chinese and Roman armies employed complex military machines including the Ballista and catapult. In the Middle Ages, the Trebuchet was developed.

Middle Era

An Iraqi by the name of al-Jazari helped influence the design of today’s modern machines when sometime in between 1174 and 1200 he built five machines to pump water for the kings of the Turkish Artuqid dynasty and their palaces. The double-acting reciprocating piston pump was instrumental in the later development of engineering in general because it was the first machine to incorporate both the connecting rod and the crankshaft, thus, converting rotational motion to reciprocating motion.

British Charter Engineer Donald Routledge Hill once wrote:
It is impossible to over emphasize the importance of al-Jazari’s work in the history of engineering, it provides a wealth of instructions for the design, manufacture and assembly of machines.

Even today some toys still use the cam-lever mechanism found in al-Jazari’s combination lock and automaton. Besides over 50 ingenious mechanical devices, al-Jazari also developed and made innovations to segmental gears, mechanical controls, escapement mechanisms, clocks, robotics, and protocols for designing and manufacturing methods.

Renaissance Era

The first electrical engineer is considered to be William Gilbert, with his 1600 publication of De Magnete, who was the originator of the term “electricity”.

The first steam engine was built in 1698 by mechanical engineer Thomas Savery. The development of this device gave rise to the industrial revolution in the coming decades, allowing for the beginnings of mass production.

With the rise of engineering as a profession in the eighteenth century, the term became more narrowly applied to fields in which mathematics and science were applied to these ends. Similarly, in addition to military and civil engineering the fields then known as the mechanic arts became incorporated into engineering.

Modern Era

Electrical Engineering can trace its origins in the experiments of Alessandro Volta in the 1800s, the experiments of Michael Faraday, Georg Ohm and others and the invention of the electric motor in 1872. The work of James Maxwell and Heinrich Hertz in the late 19th century gave rise to the field of Electronics. The later inventions of the vacuum tube and the transistor further accelerated the development of Electronics to such an extent that electrical and electronics engineers currently outnumber their colleagues of any other Engineering specialty.

The inventions of Thomas Savery and the Scottish engineer James Watt gave rise to modern Mechanical Engineering. The development of specialized machines and their maintenance tools during the industrial revolution led to the rapid growth of Mechanical Engineering both in its birthplace Britain and abroad.

Chemical Engineering, like its counterpart Mechanical Engineering, developed in the nineteenth century during the Industrial Revolution. Industrial scale manufacturing demanded new materials and new processes and by 1880 the need for large scale production of chemicals was such that a new industry was created, dedicated to the development and large scale manufacturing of chemicals in new industrial plants. The role of the chemical engineer was the design of these chemical plants and processes.

Aeronautical Engineering deals with aircraft design while Aerospace Engineering is a more modern term that expands the reach envelope of the discipline by including spacecraft design. Its origins can be traced back to the aviation pioneers around the turn of the century from the 19th century to the 20th although the work of Sir George Cayley has recently been dated as being from the last decade of the 18th century. Early knowledge of aeronautical engineering was largely empirical with some concepts and skills imported from other branches of engineering. Only a decade after the successful flights by the Wright brothers, the 1920s saw extensive development of aeronautical engineering through development of World War I military aircraft. Meanwhile, research to provide fundamental background science continued by combining theoretical physics with experiments.

The first PhD in engineering (technically, applied science and engineering) awarded in the United States went to Willard Gibbs at Yale University in 1863; it was also the second PhD awarded in science in the U.S.

In 1990, with the rise of computer technology, the first search engine was built by computer engineer Alan Emtage.

Main branches of engineering

Engineering, much like science, is a broad discipline which is often broken down into several sub-disciplines. These disciplines concern themselves with differing areas of engineering work. Although initially an engineer will be trained in a specific discipline, throughout an engineer’s career the engineer may become multi-disciplined, having worked in several of the outlined areas. Historically the main Branches of Engineering are categorized as follows:

– Aerospace Engineering – The design of aircraft, spacecraft and related topics.
– Chemical Engineering – The conversion of raw materials into usable commodities and the optimization of flow systems, especially separations.
– Civil Engineering – The design and construction of public and private works, such as infrastructure, bridges and buildings.
– Electrical Engineering – The design of electrical systems, such as transformers, as well as electronic goods.
– Mechanical Engineering – The design of physical or mechanical systems, such as engines, powertrains, kinematic chains and vibration isolation equipment.

With the rapid advancement of Technology many new fields are gaining prominence and new branches are developing such as Computer Engineering, Software Engineering, Nanotechnology, Molecular engineering, Mechatronics etc. These new specialties sometimes combine with the traditional fields and form new branches such as Mechanical Engineering and Mechatronics and Electrical and Computer Engineering.

For each of these fields there exists considerable overlap, especially in the areas of the application of sciences to their disciplines such as physics, chemistry and mathematics.

Methodology

Engineers apply the sciences of physics and mathematics to find suitable solutions to problems or to make improvements to the status quo. More than ever, Engineers are now required to have knowledge of relevant sciences for their design projects, as a result, they keep on learning new material throughout their career. If multiple options exist, engineers weigh different design choices on their merits and choose the solution that best matches the requirements. The crucial and unique task of the engineer is to identify, understand, and interpret the constraints on a design in order to produce a successful result. It is usually not enough to build a technically successful product; it must also meet further requirements. Constraints may include available resources, physical, imaginative or technical limitations, flexibility for future modifications and additions, and other factors, such as requirements for cost, safety, marketability, productibility, and serviceability. By understanding the constraints, engineers derive specifications for the limits within which a viable object or system may be produced and operated.

Problem solving

Engineers use their knowledge of science, mathematics, and appropriate experience to find suitable solutions to a problem. Engineering is considered a branch of applied mathematics and science. Creating an appropriate mathematical model of a problem allows them to analyze it (sometimes definitively), and to test potential solutions. Usually multiple reasonable solutions exist, so engineers must evaluate the different design choices on their merits and choose the solution that best meets their requirements. Genrich Altshuller, after gathering statistics on a large number of patents, suggested that compromises are at the heart of “low-level” engineering designs, while at a higher level the best design is one which eliminates the core contradiction causing the problem.

Engineers typically attempt to predict how well their designs will perform to their specifications prior to full-scale production. They use, among other things: prototypes, scale models, simulations, destructive tests, nondestructive tests, and stress tests. Testing ensures that products will perform as expected. Engineers as professionals take seriously their responsibility to produce designs that will perform as expected and will not cause unintended harm to the public at large. Engineers typically include a factor of safety in their designs to reduce the risk of unexpected failure. However, the greater the safety factor, the less efficient the design may be. The study of failed products is known as forensic engineering, and can help the product designer in evaluating his or her design in the light of real conditions. The discipline is of greatest value after disasters, such as bridge collapses, when careful analysis is needed to establish the cause or causes of the failure.

Computer use

As with all modern scientific and technological endeavors, computers and software play an increasingly important role. As well as the typical business application software there are a number of computer aided applications (CAx) specifically for engineering. Computers can be used to generate models of fundamental physical processes, which can be solved using numerical methods.

One of the most widely used tools in the profession is computer-aided design (CAD) software which enables engineers to create 3D models, 2D drawings, and schematics of their designs. CAD together with Digital mockup (DMU) and CAE software such as finite element method analysis or analytic element method allows engineers to create models of designs that can be analyzed without having to make expensive and time-consuming physical prototypes. These allow products and components to be checked for flaws; assess fit and assembly; study ergonomics; and to analyze static and dynamic characteristics of systems such as stresses, temperatures, electromagnetic emissions, electrical currents and voltages, digital logic levels, fluid flows, and kinematics. Access and distribution of all this information is generally organized with the use of Product Data Management software.

There are also many tools to support specific engineering tasks such as Computer-aided manufacture (CAM) software to generate CNC machining instructions; Manufacturing Process Management software for production engineering; EDA for printed circuit board (PCB) and circuit schematics for electronic engineers; MRO applications for maintenance management; and AEC software for civil engineering.

In recent years the use of computer software to aid the development of goods has collectively come to be known as Product Lifecycle Management (PLM).

Engineering in a social context

Engineering is a subject that ranges from large collaborations to small individual projects. Almost all engineering projects are beholden to some sort of financing agency: a company, a set of investors, or a government. The few types of engineering that are minimally constrained by such issues are pro bono engineering and open design engineering.

By its very nature engineering is bound up with society and human behavior. Every product or construction used by modern society will have been influenced by engineering design. Engineering design is a very powerful tool to make changes to environment, society and economies, and its application brings with it a great responsibility, as represented by many of the Engineering Institutions codes of practice and ethics. Whereas medical ethics is a well-established field with considerable consensus, engineering ethics is far less developed, and engineering projects can be subject to considerable controversy. Just a few examples of this from different engineering disciplines are the development of nuclear weapons, the Three Gorges Dam, the design and use of Sports Utility Vehicles and the extraction of oil. There is a growing trend amongst western engineering companies to enact serious Corporate and Social Responsibility policies, but many companies do not have these.

Engineering is a key driver of human development. Sub-Saharan Africa in particular has a very small engineering capacity which results in many African nations being unable to develop crucial infrastructure without outside aid. The attainment of many of the Millennium Development Goals requires the achievement of sufficient engineering capacity to develop infrastructure and sustainable technological development. All overseas development and relief NGOs make considerable use of engineers to apply solutions in disaster and development scenarios. A number of charitable organizations aim to use engineering directly for the good of mankind:

Engineers Without Borders
Engineers Against Poverty
Registered Engineers for Disaster Relief
Engineers for a Sustainable World

Cultural presence

Engineering is a well respected profession. For example, in Canada it ranks as one of the public’s most trusted professions.

Sometimes engineering has been seen as a somewhat dry, uninteresting field in popular culture, and has also been thought to be the domain of nerds. For example, the cartoon character Dilbert is an engineer. One difficulty in increasing public awareness of the profession is that average people, in the typical run of ordinary life, do not ever have any personal dealings with engineers, even though they benefit from their work every day. By contrast, it is common to visit a doctor at least once a year, the chartered accountant at tax time, and, occasionally, even a lawyer.

This has not always been so – most British school children in the 1950s were brought up with stirring tales of ‘the Victorian Engineers’, chief amongst whom were the Brunels, the Stephensons, Telford and their contemporaries.

In science fiction engineers are often portrayed as highly knowledgeable and respectable individuals who understand the overwhelming future technologies often portrayed in the genre. The Star Trek characters Montgomery Scott, Geordi La Forge, Miles O’Brien, B’Elanna Torres, and Charles Tucker are famous examples.

Occasionally, engineers may be recognized by the “Iron Ring”–a stainless steel or iron ring worn on the little finger of the dominant hand. This tradition began in 1925 in Canada for the Ritual of the Calling of an Engineer as a symbol of pride and obligation for the engineering profession. Some years later in 1972 this practice was adopted by several colleges in the United States. Members of the US Order of the Engineer accept this ring as a pledge to uphold the proud history of engineering.

A Professional Engineer’s name may be followed by the post-nominal letters PE or P.Eng in North America. In much of Europe a professional engineer is denoted by the letters IR, while in the UK and much of the Commonwealth the term Chartered Engineer applies and is denoted by the letters CEng.

Legislation

In most Western countries, certain engineering tasks, such as the design of bridges, electric power plants, and chemical plants, must be approved by a Professional Engineer or a Chartered Engineer or an Incorporated Engineer.
Laws protecting public health and safety mandate that a professional must provide guidance gained through education and experience. In the United States, each state tests and licenses Professional Engineers. In much of Europe and the Commonwealth professional accreditation is provided by Engineering Institutions, such as the Institution of Civil Engineers from the UK. The engineering institutions of the UK are some of the oldest in the world, and provide accreditation to many engineers around the world. In Canada the profession in each province is governed by its own engineering association. For instance, in the Province of British Columbia an engineering graduate with 4 or more years of experience in an engineering-related field will need to be registered by the Association for Professional Engineers and Geoscientists (APEGBC) in order to become a Professional Engineer and be granted the professional designation of P.Eng.

The federal US government, however, supervises aviation through the Federal Aviation Regulations administrated by the Dept. of Transportation, Federal Aviation Administration. Designated Engineering Representatives approve data for aircraft design and repairs on behalf of the Federal Aviation Administration.

Even with strict testing and licensure, engineering disasters still occur. Therefore, the Professional Engineer, Chartered Engineer, or Incorporated Engineer adheres to a strict code of ethics. Each engineering discipline and professional society maintains a code of ethics, which the members pledge to uphold.

Refer also to the Washington accord for international accreditation details of professional engineering degrees.

Relationships with other disciplines

Science
Scientists study the world as it is; engineers create the world that has never been.
—Theodore von Kármán

There exists an overlap between the sciences and engineering practice; in engineering, one applies science. Both areas of endeavor rely on accurate observation of materials and phenomena. Both use mathematics and classification criteria to analyze and communicate observations. Scientists are expected to interpret their observations and to make expert recommendations for practical action based on those interpretations. Scientists may also have to complete engineering tasks, such as designing experimental apparatus or building prototypes. Conversely, in the process of developing technology engineers sometimes find themselves exploring new phenomena, thus becoming, for the moment, scientists.

In the book What Engineers Know and How They Know It, Walter Vincenti asserts that engineering research has a character different from that of scientific research. First, it often deals with areas in which the basic physics and/or chemistry are well understood, but the problems themselves are too complex to solve in an exact manner. Examples are the use of numerical approximations to the Navier-Stokes equations to describe aerodynamic flow over an aircraft, or the use of Miner’s rule to calculate fatigue damage. Second, engineering research employs many semi-empirical methods that are foreign to pure scientific research, one example being the method of parameter variation.
As stated by Fung et al. in the revision to the classic engineering text, Foundations of Solid Mechanics,
“Engineering is quite different from science. Scientists try to understand nature. Engineers try to make things that do not exist in nature. Engineers stress invention. To embody an invention the engineer must put his idea in concrete terms, and design something that people can use. That something can be a device, a gadget, a material, a method, a computing program, an innovative experiment, a new solution to a problem, or an improvement on what is existing. Since a design has to be concrete, it must have its geometry, dimensions, and characteristic numbers. Almost all engineers working on new designs find that they do not have all the needed information. Most often, they are limited by insufficient scientific knowledge. Thus they study mathematics, physics, chemistry, biology and mechanics. Often they have to add to the sciences relevant to their profession. Thus engineering sciences are born.”
Scientists and engineers make up less than 5% of the population but create up to 50% of the GDP.

Medicine and biology

Leonardo DaVinci, has been described as the epitome of the artist/engineer. He is also known for his studies on human anatomy and physiognomy.

The study of the human body, albeit from different directions and for different purposes, is an important common link between medicine and some engineering disciplines. Medicine aims to sustain, enhance and even replace functions of the human body, if necessary, through the use of technology. Modern medicine can replace several of the body’s functions through the use of artificial organs and can significantly alter the function of the human body through artificial devices such as, for example, brain implants and pacemakers. The fields of Bionics and medical Bionics are dedicated to the study of synthetic implants pertaining to natural systems. Conversely, some engineering disciplines view the human body as a biological machine worth studying, and are dedicated to emulating many of its functions by replacing biology with technology. This has led to fields such as artificial intelligence, neural networks, fuzzy logic, and robotics. There are also substantial interdisciplinary interactions between engineering and medicine.

Both fields provide solutions to real world problems. This often requires moving forward before phenomena are completely understood in a more rigorous scientific sense and therefore experimentation and empirical knowledge is an integral part of both. Medicine, in part, studies the function of the human body. The human body, as a biological machine, has many functions that can be modeled using Engineering methods. The heart for example functions much like a pump, the skeleton is like a linked structure with levers, the brain produces electrical signals etc. These similarities as well as the increasing importance and application of Engineering principles in Medicine, led to the development of the field of biomedical engineering that utilizes concepts developed in both disciplines.

Newly emerging branches of science, such as Systems biology, are adapting analytical tools traditionally used for engineering, such as systems modeling and computational analysis, to the description of biological systems.

Art

There are connections between engineering and art; they are direct in some fields, for example, architecture, landscape architecture and industrial design (even to the extent that these disciplines may sometimes be included in a University’s Faculty of Engineering); and indirect in others. The Art Institute of Chicago, for instance, held an exhibition about the art of NASA’s aerospace design. Robert Maillart’s bridge design is perceived by some to have been deliberately artistic. At the University of South Florida, an engineering professor, through a grant with the National Science Foundation, has developed a course that connects art and engineering. Among famous historical figures Leonardo Da Vinci is a well known Renaissance artist and engineer, and a prime example of the nexus between art and engineering.

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What is Feasibility Study?

A feasibility study is a preliminary study undertaken to determine and document a project’s viability or the discipline of planning, organizing, and managing resources to bring about the successful completion of specific project goals and objectives. The term is also used to describe the preliminary analysis of an existing system to see if it is worth upgrading all or a part. Also known as feasibility analysis. The term is also used to refer to the resulting document. The results of this study are used to make a decision whether or not to proceed with the project. If it indeed leads to a project being approved, it will — before the real work of the proposed project starts and be used to ascertain the likelihood of the project’s success. It is an analysis of possible alternative solutions to a problem and a recommendation on the best alternative. It can decide, for example, whether order processing can be carried out by a new system more efficiently than the previous one.

If a project is seen to be feasible from the results of the study, the next logical step is to proceed with it. The research and information uncovered in the feasibility study will support the detailed planning and reduce the research time.

Types of Feasibility Studies

The following sections describe various types of feasibility studies.

Market and Real Estate Feasibility

Market Feasibility Study typically involves testing geographic locations for a real estate development project, and usually involves parcels of real estate land. Developers often conduct market studies to determine the best location within a jurisdiction, and to test alternative land uses for a given parcels. Jurisdictions often require developers to complete feasibility studies before they will approve a permit application for retail, commercial, industrial, manufacturing, housing, office or mixed-use project.

Technology and System Feasibility

This involves questions such as whether the technology needed for the system exists, how difficult it will be to build, and whether the firm has enough experience using that technology. The assessment is based on an outline design of system requirements in terms of Input, Processes, Output, Fields, Programs, and Procedures. This can be quantified in terms of volumes of data, trends, frequency of updating, etc in order to estimate if the new system will perform adequately or not.

Resource Feasibility

This involves questions such as how much time is available to build the new system, when it can be built, whether it interferes with normal business operations, type and amount of resources required, dependencies, etc. Contingency and mitigation plans should also be stated here so that if the project does over run the company is ready for this eventuality.

Cultural Feasibility

In this stage, the project’s alternatives are evaluated for their impact on the local and general culture. For example, environmental factors need to be considered and this factors are to be well known. Further an enterprise’s own culture can clash with the results of the project.

Operational feasibility

Do the current work practices and procedures support a new system. Also social factors i.e. how the organizational changes will affect the working lives of those affected by the system..

Legal Feasibility

Determines whether the proposed system conflicts with legal requirements, e.g. a Data Processing system must comply with the local Data Protection Acts. When an organization has either internal or external legal counsel, such reviews are typically standard. However, a project may face legal issues after completion if this factor is not considered at this stage.

Marketing and Economic Feasibility

A business plan needs to be based on the market forces that could affect the commercial viability of the business. Internal projects must establish the cost-effectiveness of the proposed system i.e. if the benefits do not outweigh the costs then it is not worth going ahead. This includes a cost benefit analysis.

Schedule Feasibility
A project will fail if it takes too long to be completed before it is useful. Typically this means estimating how long the system will take to develop, and if it can be completed in a given time period using some methods like payback period.

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A traditional fountain is an arrangement where water issues from a source (Latin fons), fills a basin of some kind, and is drained away. Fountains may be wall fountains or free-standing. In fountains sheets of water may flow over varied surfaces of stone, concrete or metal. Basins may overflow from one into another, or the overflow may imitate a natural cascade. Many fountains are located in small, artificial, ornamental ponds, basins and formal garden pools, and often they include sculpture.

One of the most common features of a fountain, if there is enough pressure, is one or more jets, in which water is forced into the air under pressure to some height. A famous example of such a modern fountain rises from the surface of Lake Geneva.

History

Early fountains depended on the natural gravitational flow of water, from a spring or aqueduct supplied by a distant and higher source of water, which provided hydraulic head.

Hellenistic hydraulic engineers employed great originality in designing fountains, where the water pressure might be employed to animate automata and water organs.

Reciprocating motion was first described in 1206 by Iraqi engineer and inventor al-Jazari when the kings of the Artuqid dynasty in Turkey commissioned him to manufacture a machine to raise water for their palaces. The finest result was an machine called the double-acting reciprocating piston pump, which translated rotary motion to reciprocating motion via the crankshaft-connecting rod mechanism.

Other early fountains were geometrically regularized springs, developed in the classic Persian garden. These gardens were typically enclosed and were designed to provide relaxation. The effect of sunlight was the main concern regarding the structural aspect of the Persian garden design. Shapes and textures were specifically chosen for their ability to direct sunlight. In the 16th century elaborate fountain displays were garden features of Mannerist gardens of Central Italy and the Mughal gardens of India.

Early Modern English employed fountain to refer to a natural spring water or source, which the 16th century garden fountain might consciously imitate in a grotto.

Fountain of life

Christian allegory made much use of the concept of the fountain, specifically the Fountain of Life, associated with the rebirth that was intended to be experienced at the Baptismal font. The Fountain of Life appears in Christian illuminated manuscripts of Late Antiquity, and elaborate Gothic fountains formed centerpieces for exclosed gardens. An offshoot of the Fountain of Life was the legend of the Fountain of Youth, which Juan Ponce de León sought in Florida. From the Fountain of Youth one can drink to gain immortality, or to regain one’s youth.

The practical Romans marked the delivery end of aqueducts with a public fountain, a practice that was revived in Rome in the 15th century, when the restored Aqua Felice once more delivered a symbolic presentation of its waters to Rome in the original Trevi Fountain, since replaced by the familiar Baroque fusion of water, architecture and sculpture.

Animated fountains

Animated fountain in Moscow’s Square of Europe, with cascades of water jets pulsating up and down to imitate the surf.

Animated fountains often use laminar jets that provide water that moves like ping pong balls in animation, so that it breaks up, as the height varies, and the behaviour of each jet operates independently with up to 5 Hz modulation frequency (1/5 second), so that the water packets collide with themselves. For example, such fountains can spit up one ball of water which then explodes, showering people with a fine mist.

A musical fountain is a type of fountain that dances in time with recorded or live music, controlled either by a computer or by a live “organist” operating the fountain through a switchboard. Notable examples of this are fountains on Vasilievsky Island in St. Petersburg, Russia, and the fountains of the Bellagio in the Las Vegas Strip.

Other meanings

In Islam, a fountain is the name of the place in the Mosque where worshippers can wash before Prayer.

A splash fountain or bathing fountain is a fountain intended for people to cool off in. Although many fountains were not designed as bathing fountains, children of all ages often use them for that purpose. Some fountains are fenced in, or have raised edges as a barricade to keep people out. In other situations, fountains are designed to allow easy access, and feature nonslip surfaces, so that people can safely use them to cool off in on hot summer days.

Splash fountains have zero standing water, to eliminate possible drowning hazards, so that no lifeguards or supervision is required. These splash pads are often located in public pools, public parks, or public playgrounds (known as “spraygrounds”).

A recent example of a public splash fountain, intended for waterplay, is the one located in Toronto’s Dundas Square. It consists of 600 ground nozzles arranged in groups of 30 (3 rows of 10 nozzles). Each group of 30 nozzles is located beneath a stainless steel grille. Twenty such grilles are arranged in two rows of 10, right in the middle of the main walkway through Dundas Square. Both the architects and the designers have confirmed that these were intended for waterplay, and the facility operators have confirmed that the water is treated to pool water quality standards, and that the water quality is tested, by the health department, at least once a day. The entire surface of Dundas Square is made of special nonslip square granite slabs that match the size of the metal grilles. The special texture on the slabs ensures that they are not slippery when wet.

Spray fountains are designed to serve as a play area where children (and sometimes adults) can run around and cool off under a canopy of water. Spray fountains are becoming popular in areas where the construction of public pools is difficult or costly, such as urban areas. However, spray fountains can also be used to enhance a pool’s surrounding play area.

A water fountain or drinking fountain is designed to provide drinking water and has a basin arrangement with either continuously running water or a tap. Modern indoor drinking fountains may incorporate filters to remove impurities from the water and chillers to reduce its temperature. In some regional dialects, water fountains are referred to as bubblers. Water fountains are usually found in public places, like schools, rest areas and grocery stores. Many jurisdictions require water fountains to be wheelchair accessible (by sticking out horizontally from the wall), and to include an additional unit of a lower height for children and short adults. The design that this replaced often had one spout atop a refrigeration unit.

Design

In modern fountains the traditional gravitational pressure from an unseen reservoir at a higher level is not always practical. In many circumstances fountains obtain their water from a closed, recirculating system that must still be filled at the start from the local water supply system and also topped up through its life to offset the effects of evaporation. Allowance must also be made to handle overflow in the case of heavy rain.

The pressure that causes water to move through the fountain may be produced instead by a motor-driven (often submersible electric) pump. “Static head” is useful to quantify this pressure.

A water filter, typically a media filter, removes particles from the water, this filter requires its own pump to force water through it and plumbing to remove the water from the pool to the filter and then back to the pool. The water may need chlorination or anti-algal treatment, or may use biological methods to filter and clean water.

The pumps, filter, electrical switch box and plumbing controls are often housed in a “plant room”. Low-voltage lighting, typically 12 volt direct current, is used to minimise electrical hazards. Lighting is often submerged and must be suitably designed. Floating fountains are also popular for ponds and lakes they consist of a float pump nozzle and water chamber.

Fountains for celebration

Many civic fountains in public parks are commissioned in commemoration of either national or public figures.

There are also some limited fountain day celebrations. The University at Albany hosts an annual “Fountain Day,” a day on which the university community comes together to celebrate the arrival of spring and the near-end of the semester. Drawing large crowds, the fountain-centered event creates something akin to an urban beach.

Fountains that are musical instruments

A hydraulophone is a fountain that can be played as a musical instrument. These fountains are like woodwind instruments, but using water instead of air. The embouchure of the instrument occurs at the finger holes (referred to as “mouths”). Hydraulophones often have multiple “mouths”, so that a player can put each finger into a different mouth at the same time, in order to play chords, while independently manipulating each finger for separate and individual control of the embouchure of each note in a chord. A skilled hydraulist can slightly “bend” each note in order to play just intonation in any desired key, or to gently and fluidly vary intonation or temperament as a piece of music changes from one key to another.

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Hydraulics is a topic of science and engineering dealing with the mechanical properties of liquids. Hydraulics is part of the more general discipline of fluid power. Fluid mechanics provides the theoretical foundation for hydraulics, which focuses on the engineering uses of fluid properties. Hydraulic topics range through most science and engineering disciplines, and cover concepts such as pipe flow, dam design, fluidics and fluid control circuitry, pumps, turbines, hydropower, computational fluid dynamics, flow measurement, river channel behavior and erosion. However if used incorrectly, hydraulic instruments can result in weird occurrences because of the nature of high pressure fluids.

The word “hydraulics” originates from the Greek word ὑδραυλικός (hydraulikos) which in turn originates from ὕδραυλος (hydraulos) meaning water organ which in turn comes from ὕδωρ (hydor, Greek for water) and αὐλός (aulos, meaning pipe).

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Hydrotherapy, formerly called hydropathy involves the use of water for soothing pains and treating diseases.

Its use has been recorded in ancient Egyptian, Greek and Roman civilizations. Egyptian royalty bathed with essential oils and flowers, while Romans had communal public baths for their citizens. Hippocrates prescribed bathing in spring water for sickness. A Dominican monk, Sebastian Kneipp, again revived it during the 19th century. His book My Water Cure in 1886 was published and translated into many languages. The use of water to treat rheumatic diseases has a long history. Today, hydrotherapy is used to treat musculoskeletal disorders such as arthritis, ankylosing spondylitis, or spinal cord injuries and in patients suffering burns, spasticity, stroke or paralysis. It is also used to treat orthopedic and neurological conditions in dogs and horses and to improve fitness.

Historical background

Hydrotherapy in general dates back to ancient cultures from China, Japan (Onsen, Japanese Hot Springs), and most recently to the Thermae (Roman Hot Springs). After an oblivion during the Middle Ages, hydrotherapy was rediscovered during the 18th and 19th century by J.S.Hahn (1696-1773), MD, Vincent Priessnitz, Oertel (1764-1850), and Rausse (1805-1848). In Woerrishofen (south Germany) Sebastian Kneipp developed the systematic and controlled application of hydrotherapy for the support of medical treatment which was delivered only by doctors at that time.

Cold water bathing and drinking

Hydrotherapy as a formal medical tool dates from about 1829 when Vincent Priessnitz, a farmer of Gräfenberg in Silesia, Austrian Empire, began his public career in the paternal homestead, extended so as to accommodate the increasing numbers attracted by the fame of his cures. Two English works, however, on the medical uses of water had been translated into German in the century preceding the rise of the movement under Priessnitz. One of these was by Sir John Floyer, a physician of Lichfield, who, struck by the remedial use of certain springs by the neighboring peasantry, investigated the history of cold bathing and published in 1702 his IvxpoXovoLa, or the History of Cold Bathing, both Ancient and Modern. The book ran through six editions within a few years and the translation was largely drawn upon by Dr J. S. Hahn of Silesia in a work published in 1738 On the Healing Virtues of Cold Water, Inwardly and Outwardly applied, as proved by Experience. The other work was that of Dr James Currie of Liverpool entitled Medical Reports on the Effects of Water, Cold and Warm, as a remedy in Fevers and other Diseases published in 1797 and soon after translated into German by Michaelis (1801) and Hegewisch (1807). It was highly popular and first placed the subject on a scientific basis. Hahn’s writings had meanwhile created much enthusiasm among his countrymen, societies having been everywhere formed to promote the medicinal and dietetic use of water; and in 1804 Professor Ortel of Ansbach republished them and quickened the popular movement by unqualified commendation of water drinking as a remedy for all diseases. In him the rising Priessnitz found a zealous advocate, and doubtless an instructor also.

At Gräfenberg, to which the fame of Priessnitz drew people of every rank and many countries, medical men were conspicuous by their numbers, some being attracted by curiosity, others by the desire of knowledge, but the majority by the hope of cure for ailments which had as yet proved incurable. Many records of experiences at Gräfenberg were published, all more or less favorable to the claims of Priessnitz, and some enthusiastic in their estimate of his genius and penetration; Captain Claridge introduced hydropathy into England in 1840, his writings and lectures, and later those of Sir W. Erasmus Wilson (1809 – 1884), James Manby Gully and Edward Johnson, making numerous converts, and filling the establishments opened soon after at Islalvern and elsewhere. In Germany, France and America hydropathic establishments multiplied with great rapidity. Antagonism ran high between the old practice and the new. Unsparing condemnation was heaped by each on the other; and a legal prosecution, leading to a royal commission of inquiry, served but to make Priessnitz and his system stand higher in public estimation.

Increasing popularity soon diminished caution whether the new method would help minor ailments and be of benefit to the more seriously injured. Hydropathists to occupied themselves mainly with studying chronic invalids well able to bear a rigorous regimen and the severities of unrestricted crisis. The need of a radical adaptation to the former class was first adequately recognized by John Smedley, a manufacturer of Derbyshire, who, impressed in his own person with the severities as well as the benefits of the cold water cure, practised among his workpeople a milder form of hydropathy, and began about 1852 a new era in its history, founding at Matlock a counterpart of the establishment at Gräfenberg.

Ernst Brand (1826 – 1897) of Berlin, Raljen and Theodor von Jürgensen of Kiel, and Karl Liebermeister of Basel, between 1860 and 1870, employed the cooling bath in abdominal typhus with striking results, and led to its introduction to England by Dr Wilson Fox. In the Franco-German War the cooling bath was largely employed, in conjunction frequently with quinine; and it was used in the treatment of hyperpyrexia.

The use of heat

The Turkish bath, introduced by David Urquhart into England on his return from the East, and ardently adopted by Richard Barter, became a public institution, and, with the morning tub and the general practice of water drinking, is the most noteworthy of the many contributions by hydropathy to public health.

Until around 1840, hydropathy was not common in the United States although it was popular in Europe in the 19th century. But in “Nature’s Cures”, Michael Castleman wrote that hundreds of ‘water-cures’ were located on the countryside during the Civil War.

State of the field at the beginning of the 1900s

The following material is from the 1911 Encyclopedia Britannica and thus represents the state of the field at the beginning of the 1900s.

Forms of hydrotherapy

Packings

The full pack consists of a wet sheet enveloping the body, with a number of dry blankets packed tightly over it, including a macintosh covering or not. In an hour or less these are removed and a general bath administered. The pack is a derivative, sedative, sudorific and stimulator of cutaneous excretion. The trapped body heat causes the patient to be warmed. There are numerous modifications of it, notably the cooling pack, where the wrappings are loose and scanty, permitting evaporation, and the application of indefinite duration, the sheet being rewetted as it dries; this was used to deal with fever. There are also local packs, to trunk, limbs or head separately, which are derivative, soothing or stimulating, according to circumstance and detail.

Hot air baths
Hot air baths or saunas, the chief of which is the Turkish (properly, the Roman) bath, consisting of two or more chambers ranging in temperature from 50°C to 100°C or higher, but mainly used at 66°C for curative purposes. Exposure is from twenty minutes up to two hours according to the effect sought, and is followed by a general bath, and occasionally by soaping and shampooing. It is stimulating, derivative, depurative, sudorific and alternative, powerfully promoting tissue change by increase of the natural waste and repair. It determines the blood to the surface, reducing internal congestions, is a potent diaphoretic, and, through the extremes of heat and cold, is an effective nervous and vascular stimulant and tonic. Morbid growths and secretions, as also the uraemic, gouty and rheumatic diathesis, were believed to be beneficially influenced by it. The full pack and Turkish bath for a while seemed to be replacing the once familiar hot bath. The Russian or steam bath and the lamp bath are primitive and inferior varieties of the modern Turkish bath, the atmosphere of which cannot be too dry and pure.

General baths
General baths comprise the rain (or needle), spray (or rose), shower, shallow, plunge, douche, wave and common morning sponge baths, with the dripping sheet, and hot and cold spongings, and are combinations, as a rule, of hot and cold water.

Local baths
Local baths comprise the sitz, douche (or spouting), spinal, foot and head baths, of hot or cold water, singly or in combination, successive or alternate. The sitz, head and foot baths are used flowing on occasion. The application of cold by Leiters tubes was believed to be effective for reducing inflammation (e.g. in meningitis and in sunstroke); in these a network of metal or indiarubber tubing is fitted to the part affected, and cold water kept continuously flowing through them. Rapid alternations of hot and cold water was believed to have a powerful effect in vascular stasis and lethargy of the nervous system and absorbents, benefitting local congestions and chronic inflammations.

Compresses
Bandages (or compresses) are of two kinds,cooling, of wet material left exposed for evaporation, used in local infiammations and fevers; and heating, of the same, covered with waterproof material, used in congestion, external or internal, for short or long periods. Poultices, warm, of bread, linseed, bran, &c., changed but twice in twenty-four hours, are identical in action with the heating bandage, and superior only in the greater warmth and consequent vital activity their closer application to the skin ensures.

Other
Fomentations and poultices, hot or cold, sinapisms, stupes, rubefacients, irritants, frictions, kneadings, calisthenics, gymnastics, electricity, &c., are adjuncts largely employed.

Effects of modern medicine

Modern medicine’s successes, particularly with drug therapy, removed or replaced many water-related therapies during the mid-20th century. Water is now used mostly in physical therapy, as a cleansing agent, and a medium for delivery of heat and cold to the body.

Various forms of hydrotheraph were used to treat alcoholism before World War II and is used today in alternative medicine.
The appliances and arrangements by means of which heat and cold are brought to bear are (a) packings, hot and cold, general and local, sweating and cooling; (b) hot air and steam baths; (c) general baths, of hot water and cold; (d) sitz, spinal, head and foot baths; (e) bandages (or compresses), wet and dry; also (f) fomentations and poultices, hot and cold, sinapisms, stupes, rubbings and water potations, hot and cold.

Submersive hydrotherapy

Hydrotherapy which involves submerging all or part of the body in water can involve several types of equipment:

Whirling water movement, provided by mechanical pumps, has been used in water tanks since at least the 1940s. Similar technologies have been marketed for recreational use under the terms “hot tub” or “spa”.

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An indoor waterpark is a type of waterpark that is located inside a building. An indoor waterpark has the ability to stay open year-round, as it is not affected by weather conditions.

History
The first ever indoor waterpark was built in Edmonton, Alberta, Canada in 1985 at the West Edmonton Mall. It is called the World Waterpark and is over 200,000 sq ft (19,000 m2). It was a success for the mall. The first indoor waterpark in the U.S. was built in Wisconsin Dells, Wisconsin at the Polynesian Hotel. They built it in 1994 so it could make the Dells a “year round destination”, as the Wisconsin Dells tourist season was from Memorial Day to Labor Day before it was built.

The Indoor Waterpark Craze

Since the opening of the first park, the indoor waterpark business has become increasingly more popular, especially for the Edmonton area in Canada, and in the Wisconsin Dells in the U.S., which proclaims itself as the “waterpark capital of the world”. The Dells has 5 Waterpark Resorts that have at least 1 waterpark
bigger that 55,000 sq ft (5,100 m2). This includes the Kalahari Resort (Wisconsin’s Largest Indoor Waterpark), Chula Vista Resort (Lost Rios), Great Wolf Lodge, Wilderness Territory (Wild West, Klondike Kavern, Wild WaterDome), and the Hotel Rome at Mt. Olympus. Wisconsin has the most indoor waterparks in one state. Other states in the U.S., especially in the midwest, are building more indoor waterparks separate or to existing hotels so they can become a year-round destination. More waterparks are also being built in Canada, Europe and Asia.

What Does a Major Indoor Waterpark Consist Of?

Most major indoor waterparks over 50,000 sq ft (the average size for an indoor waterpark in July 2008) have:

– 2-3+ Tube Slides
– 2-3+ Body Slides
– 1+ Speed Slides
– Children’s Play Area with sprayers, tipping buckets, slides, and geysers
– 1+ Family Rides (Ride that can occupy over 3 guests)
– Lazy River or Torrent River
– Wave Pool
– Water Coaster (Master Blaster)
– Other Attractions (FlowRider, Mat Racing Slides, Tornado Vortex Ride, Pro Bowl/Behehmoth Bowl, etc.)

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Irrigation is an artificial application of water to the soil usually for assisting in growing crops. In crop production it is mainly used in dry areas and in periods of rainfall shortfalls, but also to protect plants against frost. Additionally irrigation helps to suppress weed growing in rice fields. In contrast, agriculture that relies only on direct rainfall is referred to as rain-fed farming. Irrigation is often studied together with drainage, which is the natural or artificial removal of surface and sub-surface water from a given area.

Irrigation is also a term used in the Medical/Dental fields and refers to flushing and washing out anything with water or another liquid.

History

Archaeological investigation has identified evidence of irrigation in Mesopotamia and Egypt as far back as the 6th millennium BCE, where barley was grown in areas where the natural rainfall was insufficient to support such a crop.

In the Zana Valley of the Andes Mountains in Peru, archaeologists found remains of three irrigation canals radiocarbon dated from the 4th millennium BCE, the 3rd millennium BCE and the 9th century CE. These canals are the earliest record of irrigation in the New World. Traces of a canal possibly dating from the 5th millennium BCE were found under the 4th millennium canal. Sophisticated irrigation and storage systems were developed by the Indus Valley Civilization in Pakistan and North India, including the reservoirs at Girnar in 3000 BCE and an early canal irrigation system from circa 2600 BCE. Large scale agriculture was practiced and an extensive network of canals was used for the purpose of irrigation.

There is evidence of the ancient Egyptian pharaoh Amenemhet III in the twelfth dynasty (about 1800 BCE) using the natural lake of the Faiyum Oasis as a reservoir to store surpluses of water for use during the dry seasons, as the lake swelled annually as caused by the annual flooding of the Nile.

The Qanats, developed in ancient Persia in about 800 BCE, are among the oldest known irrigation methods still in use today. They are now found in Asia, the middle east and north Africa. The system comprises a network of vertical wells and gently sloping tunnels driven into the sides of cliffs and steep hills to tap groundwater. The noria, a water wheel with clay pots around the rim powered by the flow of the stream (or by animals where the water source was still), was first brought into use at about this time, by Roman settlers in North Africa. By 150 BCE the pots were fitted with valves to allow smoother filling as they were forced into the water.

The irrigation works of ancient Sri Lanka, the earliest dating from about 300 BCE, in the reign of King Pandukabhaya and under continuous development for the next thousand years, were one of the most complex irrigation systems of the ancient world. In addition to underground canals, the Sinhalese were the first to build completely artificial reservoirs to store water. The system was extensively restored and further extended during the reign of King Parakrama Bahu (1153 – 1186 CE).

The oldest known hydraulic engineers of China were Sunshu Ao (6th century BCE) of the Spring and Autumn Period and Ximen Bao (5th century BCE) of the Warring States period, both of whom worked on large irrigation projects. In the Szechwan region belonging to the State of Qin of ancient China, the Dujiangyan Irrigation System was built in 256 BCE to irrigate an enormous area of farmland that today still supplies water. By the 1st century AD, during the Han Dynasty, the Chinese also used chain pumps that lifted water from lower elevation to higher elevation. These were powered by manual foot pedal, hydraulic waterwheels, or rotating mechanical wheels pulled by oxen. The water was used for public works of providing water for urban residential quarters and palace gardens, but mostly for irrigation of farmland canals and channels in the fields.

In fifteenth century Korea the world’s first water gauge, woo ryang gyae (Korean:우량계), was discovered in 1441 CE. The inventor was Jang Young Sil, a Korean engineer of the Choson Dynasty, under the active direction of the King, Se Jong. It was installed in irrigation tanks as part of a nationwide system to measure and collect rainfall for agricultural applications. With this instrument, planners and farmers could make better use of the information gathered in the survey.

Present extent

By the middle of the 20th century, the advent of diesel and electric motors led for the first time to systems that could pump groundwater out of major aquifers faster than it was recharged. This can lead to permanent loss of aquifer capacity, decreased water quality, ground subsidence, and other problems. The future of food production in such areas as the North China Plain, the Punjab, and the Great Plains of the US is threatened.

At the global scale 27,88,000 km² (689 million acres) of agricultural land was equipped with irrigation infrastructure around the year 2000. About 68% of the area equipped for irrigation is located in Asia, 17% in America, 9% in Europe, 5% in Africa and 1% in Oceania. The largest contiguous areas of high irrigation density are found in North India and Pakistan along the rivers Ganges and Indus, in the Hai He, Huang He and Yangtze basins in China, along the Nile river in Egypt and Sudan, in the Mississippi-Missouri river basin and in parts of California. Smaller irrigation areas are spread across almost all populated parts of the world.

Types of irrigation

Various types of irrigation techniques differ in how the water obtained from the source is distributed within the field. In general, the goal is to supply the entire field uniformly with water, so that each plant has the amount of water it needs, neither too much nor too little.

Surface irrigation

In surface irrigation systems water moves over and across the land by simple gravity flow in order to wet it and to infiltrate into the soil. Surface irrigation can be subdivided into furrow, borderstrip or basin irrigation. It is often called flood irrigation when the irrigation results in flooding or near flooding of the cultivated land. Historically, this has been the most common method of irrigating agricultural land.

Where water levels from the irrigation source permit, the levels are controlled by dikes, usually plugged by soil. This is often seen in terraced rice fields (rice paddies), where the method is used to flood or control the level of water in each distinct field. In some cases, the water is pumped, or lifted by human or animal power to the level of the land.

Localized irrigation

Localized irrigation is a system where water is distributed under low pressure through a piped network, in a pre-determined pattern, and applied as a small discharge to each plant or adjacent to it. Drip irrigation, spray or micro-sprinkler irrigation and bubbler irrigation belong to this category of irrigation methods.

Drip Irrigation

Drip irrigation, also known as trickle irrigation, functions as its name suggests. Water is delivered at or near the root zone of plants, drop by drop. This method can be the most water-efficient method of irrigation, if managed properly, since evaporation and runoff are minimized.[citation needed] In modern agriculture, drip irrigation is often combined with plastic mulch, further reducing evaporation, and is also the means of delivery of fertilizer. The process is known as fertigation.

Deep percolation, where water moves below the root zone, can occur if a drip system is operated for too long of a duration or if the delivery rate is too high. Drip irrigation methods range from very high-tech and computerized to low-tech and relatively labor-intensive. Lower water pressures are usually needed than for most other types of systems, with the exception of low energy center pivot systems and surface irrigation systems, and the system can be designed for uniformity throughout a field or for precise water delivery to individual plants in a landscape containing a mix of plant species. Although it is difficult to regulate pressure on steep slopes, pressure compensating emitters are available, so the field does not have to be level. High-tech solutions involve precisely calibrated emitters located along lines of tubing that extend from a computerized set of valves. Both pressure regulation and filtration to remove particles are important. The tubes are usually black (or buried under soil or mulch) to prevent the growth of algae and to protect the polyethylene from degradation due to ultraviolet light. But drip irrigation can also be as low-tech as a porous clay vessel sunk into the soil and occasionally filled from a hose or bucket. Subsurface drip irrigation has been used successfully on lawns, but it is more expensive than a more traditional sprinkler system. Surface drip systems are not cost-effective (or aesthetically pleasing) for lawns and golf courses. In the past one of the main disadvantages of the subsurface drip irrigation (SDI) systems, when used for turf, was the fact of having to install the plastic lines very close to each other in the ground, therefore disrupting the turfgrass area. Recent technology developments on drip installers like the drip installer at New Mexico State University Arrow Head Center, places the line underground and covers the slit leaving no soil exposed.

Sprinkler irrigation

In sprinkler or overhead irrigation, water is piped to one or more central locations within the field and distributed by overhead high-pressure sprinklers or guns. A system utilizing sprinklers, sprays, or guns mounted overhead on permanently installed risers is often referred to as a solid-set irrigation system. Higher pressure sprinklers that rotate are called rotors and are driven by a ball drive, gear drive, or impact mechanism. Rotors can be designed to rotate in a full or partial circle. Guns are similar to rotors, except that they generally operate at very high pressures of 40 to 130 lbf/in² (275 to 900 kPa) and flows of 50 to 1200 US gal/min (3 to 76 L/s), usually with nozzle diameters in the range of 0.5 to 1.9 inches (10 to 50 mm). Guns are used not only for irrigation, but also for industrial applications such as dust suppression and logging.

Sprinklers may also be mounted on moving platforms connected to the water source by a hose. Automatically moving wheeled systems known as traveling sprinklers may irrigate areas such as small farms, sports fields, parks, pastures, and cemeteries unattended. Most of these utilize a length of polyethylene tubing wound on a steel drum. As the tubing is wound on the drum powered by the irrigation water or a small gas engine, the sprinkler is pulled across the field. When the sprinkler arrives back at the reel the system shuts off. This type of system is known to most people as a “waterreel” traveling irrigation sprinkler and they are used extensively for dust suppression, irrigation, and land application of waste water. Other travelers use a flat rubber hose that is dragged along behind while the sprinkler platform is pulled by a cable. These cable-type travelers are definitely old technology and their use is limited in today’s modern irrigation projects.

Center pivot irrigation

Center pivot irrigation is a form of sprinkler irrigation consisting of several segments of pipe (usually galvanized steel or aluminum) joined together and supported by trusses, mounted on wheeled towers with sprinklers positioned along its length. The system moves in a circular pattern and is fed with water from the pivot point at the center of the arc. These systems are common in parts of the United States where terrain is flat.

Most center pivot systems now have drops hanging from a u-shaped pipe called a gooseneck attached at the top of the pipe with sprinkler heads that are positioned a few feet (at most) above the crop, thus limiting evaporative losses. Drops can also be used with drag hoses or bubblers that deposit the water directly on the ground between crops. The crops are planted in a circle to conform to the center pivot. This type of system is known as LEPA (Low Energy Precision Application). Originally, most center pivots were water powered. These were replaced by hydraulic systems (T-L Irrigation) and electric motor driven systems (Lindsay, Reinke, Valley, Zimmatic, Pierce, Grupo Chamartin. Most systems today are driven by an electric motor mounted low on each span. This drives a reduction gearbox and transverse driveshafts transmit power to another reduction gearbox mounted behind each wheel. Precision controls, some with GPS location and remote computer monitoring, are now available.

Lateral move (side roll, wheel line) irrigation

A series of pipes, each with a wheel of about 1.5 m diameter permanently affixed to its midpoint and sprinklers along its length, are coupled together at one edge of a field. Water is supplied at one end using a large hose. After sufficient water has been applied, the hose is removed and the remaining assembly rotated either by hand or with a purpose-built mechanism, so that the sprinklers move 10 m across the field. The hose is reconnected. The process is repeated until the opposite edge of the field is reached. This system is less expensive to install than a center pivot, but much more labor intensive to operate, and it is limited in the amount of water it can carry. Most systems utilize 4 or 5-inch (130 mm) diameter aluminum pipe. One feature of a lateral move system is that it consists of sections that can be easily disconnected. They are most often used for small or oddly-shaped fields, such as those found in hilly or mountainous regions, or in regions where labor is inexpensive.

Sub-irrigation

Subirrigation also sometimes called seepage irrigation has been used for many years in field crops in areas with high water tables. It is a method of artificially raising the water table to allow the soil to be moistened from below the plants’ root zone. Often those systems are located on permanent grasslands in lowlands or river valleys and combined with drainage infrastructure. A system of pumping stations, canals, weirs and gates allows it to increase or decrease the water level in a network of ditches and thereby control the water table.
Sub-irrigation is also used in commercial greenhouse production, usually for potted plants. Water is delivered from below, absorbed upwards, and the excess collected for recycling. Typically, a solution of water and nutrients floods a container or flows through a trough for a short period of time, 10-20 minutes, and is then pumped back into a holding tank for reuse. Sub-irrigation in greenhouses requires fairly sophisticated, expensive equipment and management. Advantages are water and nutrient conservation, and labor-saving through lowered system maintenance and automation. It is similar in principle and action to subsurface drip irrigation.

Manual irrigation using buckets or watering cans
These systems have low requirements for infrastructure and technical equipment but need high labor inputs. Irrigation using watering cans is to be found for example in peri-urban agriculture around large cities in some African countries.

Automatic, non-electric irrigation using buckets and ropes
Besides the common manual watering by bucket, an automated, natural version of this also exist. Using plain polyester ropes combined with a prepared ground mixture can be used to water plants from a vessel filled with water. The ground mixture would need to be made depending on the plant itself, yet would mostly consist of black potting soil, vermiculite and perlite. This system would (with certain crops) allow you to save expenses as it does not consume any electricity and only little water (unlike sprinklers, water timers,…). However, it may only be used with certain crops (probably mostly larger crops that do not need a humid environment; perhaps e.g. paprika’s).

Irrigation using stones to catch water from humid air
In countries where at night, humid air sweeps the countryside, stones are used to catch water from the humid air by condensation. This is for example practiced in the vineyards at Lanzarote.

Dry terraces for irrigation and water distribution
In subtropical countries as Mali and Senegal, a special type of terracing (without flood irrigation or intent to flatten farming ground) is used. Here, a ‘stairs’ is made through the use of ground level differences which helps to decrease water evaporation and also distributes the water to all patches (sort of irrigation).

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Landscape architecture involves the investigation and designed response to the landscape. The scope of the profession includes architectural design, site planning, environmental restoration, town or urban planning, urban design, parks and recreation planning. A practitioner in the field of landscape architecture is called a landscape architect.

History

The history of landscape architecture is related to the history of gardening but is not coextensive. Both arts are concerned with the composition of planting, landform, water, paving and other structures but:

The Romans undertook landscape architecture on an extensive scale, and Vitruvius wrote on many topics (eg the layout of towns) which still concern landscape architects. As with the other arts, it was not until the Renaissance that garden design was revived, with outstanding examples including the pleasure grounds at the Villa d’Este, Tivoli. The renaissance garden developed through the 16th and 17th centuries, reaching an ultimate grandeur in the work of André le Nôtre at Vaux-le-Vicomte and Versailles.

In the 18th century, England became the focus of a new style of landscape design. Figures such as William Kent, Humphry Repton, and most famously Lancelot ‘Capability’ Brown remodelled the great estate parks of the English gentry to resemble a neat and tidy version of nature. Many of these parks remain today. The term ‘landscape architecture’ was first used by the Scotsman Gilbert Laing Meason in the title of his book on The Landscape Architecture of the Great Painters of Italy (London, 1828). It was about the type of architecture found in landscape paintings. The term “landscape architecture” was then taken up by JC Loudon and AJ Downing.

Through the 19th century, urban planning became more important, and it was the combination of modern planning with the tradition of landscape gardening that gave Landscape Architecture its unique focus. In the second half of the century, Frederick Law Olmsted completed a series of parks which continue to have a huge influence on the practices of Landscape Architecture today. Among these were Central Park in New York, Prospect Park in Brooklyn, and Boston’s so called Emerald Necklace park system.

Landscape architecture continues to develop as a design discipline, and has responded to many of the movements of design and architecture through the 20th century. Today, a healthy level of innovation continues to provide challenging design solutions for streetscapes, parks and gardens. The work of Martha Schwartz in the US, and in Europe designs such as Schouwburgplein in Rotterdam by the Dutch design group West 8 are just two examples.

Ian McHarg is considered an important influence on the modern Landscape Architecture profession and land planning in particular. With his book “Design with Nature”, he popularized a system of analyzing the layers of a site in order to compile a complete understanding of the qualitative attributes of a place. This system became the foundation of today’s Geographic Information Systems (GIS). McHarg would give every qualitative aspect of the site a layer, such as the history, hydrology, topography, vegetation, etc. GIS software is ubiquitously used in the landscape architecture profession today to analyze materials in and on the earth’s surface and is similarly used by Urban Planners, Geographers, Forestry and Natural Resources professionals, etc.

Duties

Landscape architecture is a multi-disciplinary field, which includes: geography, mathematics, science, engineering, art, horticulture, technology, social sciences, politics, history, philosophy and more recently, ecology. The activities of a landscape architect can range from the creation of public parks and parkways to site planning for corporate office buildings, from the design of residential estates to the design of civil infrastructure and the management of large wilderness areas or reclamation of degraded landscapes such as mines or landfills. Landscape architects work on all types of structures and external space – large or small, urban or rural, and with “hard”/”soft” materials, hydrology and ecological issues.

The breadth of the professional task that landscape architects collaborate on is very broad, but some examples of project types include:

The most valuable contribution is often made at the earliest stage of a project in generating ideas and bringing flair and creativity to the use of space. The landscape architect can contribute to the overall concept and prepare an initial master plan, from which detailed designs can subsequently be prepared. He or she can also let and supervise contracts for construction work, prepare design impact assessments, conduct environmental assessments or audits and act as an expert witness at inquiries on land use. He or she can also support or prepare applications for capital or revenue funding grants.

For the period before 1800 the history of landscape architecture is largely that of master planning. The first person to write of “making” a landscape was Joseph Addison in 1712. The term “landscape gardener” was invented by William Shenstone in 1754 but the first professional designer to use this term was Humphry Repton in 1794. The term “landscape architecture” was invented by Gilbert Laing Meason in 1828 and was first used as a professional title by Frederick Law Olmsted in 1863. Lancelot Brown, (also known as “Capability” Brown), who remains one of the best known “landscape gardeners” actually called himself a “place maker”. During the nineteenth century, the term “landscape gardener” became applied to people who build (and sometimes design) landscapes and the term “landscape architect” became reserved for people who design (and sometimes build) landscapes. This use of “landscape architect” became established after the American Society of Landscape Architects was founded in 1899 and the International Federation of Landscape Architects (IFLA) in 1948.

Specializations

Landscape designers and Landscape technicians or engineers are employed with landscape construction and service companies or may be independent professionals. Landscape designers, like garden designers, design all types of planting and green spaces – and are not registered. Many landscape engineers work in public offices in central and local government while others work for landscape architecture firms.

Landscape managers use their knowledge of plants and the natural environment to advise on the long-term care and development of the landscape. Landscape managers work in horticulture, estate management, forestry, nature conservation and agriculture.

Landscape scientists have specialist skills such as soil science, hydrology, geomorphology or botany that they relate to the practical problems of landscape work. Their projects can range from site surveys to the ecological assessment of broad areas for planning or management purposes. They may also report on the impact of development or the importance of particular species in a given area.

Landscape planners are concerned with landscape planning for the location, scenic, ecological and recreational aspects of urban, rural and coastal land use. Their work is embodied in written statements of policy and strategy, and their remit includes masterplanning for new developments, landscape evaluations and assessments, and preparing countryside management or policy plans. Some may also apply an additional specialism such as landscape archaeology or law to the process of landscape planning.

Garden designers are concerned with the design of small gardens and outdoor spaces and also with historic garden conservation.

Green roof designers design extensive and intensive roof gardens for storm water management, sustainable architecture, aesthetics, and habitat creation.

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A lazy river is a water ride found in many amusement parks or water parks. They are also found at some resorts and recreation centers. It usually consists of shallow (2 1/2 ft. to 3 1/2 ft.) pool that flows similarly to a river. There is generally a slow current, usually just enough to allow guests to gently ride along lying on rafts. There may also be scenic elements added, such as small waterfalls on the edge of the river. Some lead into wave pools, while some just go around in circles.

A torrent river, or wave river, is a related concept. Torrent rivers feature wave machines similar to those that are in wave pools; the waves then push riders (who are on rafts, as they are in a regular lazy river) around the river faster than they would be traveling in a regular lazy river. Torrent rivers appear at all of the Schlitterbahn water parks. Most have a policy of no swimming-everybody must ride in a tube.

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A leisure centre in the UK and Canada is a purpose built building or site, usually owned and operated by the borough councilor district council, where people go to keep fit or relax through using the facilities.

Typical Facilities
Facilities may include a swimming pool, large sports hall, squash courts, cafeteria, licensed bar, fitness suite, aerobics studios, outdoor grass and/or artificial pitches for football (soccer), hockey etc, a solarium, sauna and/or steam room.

Leisure centres in the UK and Canada are staffed by leisure centre attendants employed by the local council. They carry out a range of tasks to help and supervise people using leisure centre facilities and act as swimming pool life guards, gym instructors and coaches offering advice, motivation and expertise to users.

In some areas of the UK and Canada (such as Calgary) these services are now operated by private companies on contract to the local authority.

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An obstacle course is a series of challenging physical obstacles an individual or team must navigate usually while being timed. Obstacle courses can include running, climbing, jumping, crawling and balancing elements with the aim of testing endurance; sometimes a course involves mental tests.

Types of courses

Military

The military obstacle course is used (mostly in boot camp) as a way to familiarize recruits with the kind of tactical movement they will use in combat, as well as for physical training, building teamwork, and evaluating problem solving skills. Typical courses involve obstacles the participants must climb over, crawl under, balance, hang, jump, etc. Puddles of muddy water, ropes/nets, and “no touch” restrictions are often used to make the course more difficult. They tend to be outdoors. Often, specialized courses are made to focus on specific needs, such as night movement, assault, and bayonet training. Military courses can also contain climbing walls and rappelling walls.

At the Royal Military College of Canada in Kingston, Ontario, officer cadets in first year participate in an obstacle course, which is designed by senior cadets. The obstacle course lasts a little over an hour, consists of thirteen obstacles built by each squadron located around the RMC grounds. Obstacles such as a 12-foot wall and truck pulling are designed to test teamwork and physical fitness of First Years. The First Year flights are judged on the time it takes to complete each obstacle. The annual obstacle course race is memorialized by a sculpture by John Boxtel, “To Overcome”, which was a gift of the class of 1991. Officer Cadets in third year take a physical education courses Obstacle Course and Water Borne Training. In the Obstacle course, cadets design obstacles with the available equipment and are evaluated on their leadership and innovation in the design of an obstacle course for their classmates. In the Water Borne training, cadets learn about aquatic obstacle courses training and improve their basic swimming skills.

Inflatable
Inflatable (air filled) obstacle courses can have participants go through a variety of areas like the Bish Bash, a tall loose structure to push or wade through, nets to crawl under, walls to climb over and holes to jump through. Some larger inflatables have even more areas. Inflatable obstacle courses are used for corporate events, youth events, sports centres and parties.

Assault
An assault obstacle course can be done inside or outside. The outside course is usually messy and filled with mud and muddy water. An inside course is similar to an inflatable course, but it is used in physical education lessons or holiday camps, using gym equipment or whatever is at hand.

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A playground or play area is an area designed for children to play, indoors or outdoors.

Modern playgrounds often have recreational equipment such as the see-saw, merry-go-round, swingset, slide, jungle gym, chin-up bars, sandbox, spring rider, monkey bars, overhead ladder, trapeze rings, playhouses, and mazes, many of which help children develop physical coordination, strength, and flexibility, as well as providing recreation and enjoyment. Common in modern playgrounds are “play structures” that link many different pieces of equipment.

Playgrounds often also have facilities for playing informal games of adult sports, such as a baseball diamond, a skating rink, a basketball court, or a tether ball.

“Public” playground equipment refers to equipment intended for use in the play areas of parks, schools, child care facilities, institutions, multiple family dwellings, restaurants, resorts, and recreational developments, and other areas of public use.

A type of playground called a playscape is designed to provide a safe environment for play in a natural setting.

About playgrounds

Professionals recognize that the social skills that children develop on the playground become lifelong skill sets that are carried forward into their adulthood. Independent research concludes that playgrounds are among the most important environments for children outside the home. Most forms of play are essential for healthy development, but free, spontaneous play—the kind that occurs on playgrounds—is the most beneficial type of play.

Children have devised many playground games and pastimes. But because playgrounds are usually subject to adult supervision and oversight, young children’s street culture often struggles to fully thrive there. Research by Robin Moore (Childhood’s Domain: Play and Place, 1986) has clearly shown that playgrounds need to be balanced with marginal areas that (to adults) appear to be derelict or wasteground but to children they are area’s that they can claim for themselves, ideally a wooded area or field.

A type of playground called a playscape can provide children with the necessary feeling of ownership that Moore describes above. Playscapes can also provide parents with the assurance of their child’s safety and wellbeing, which may not be prevalent in an open field or wooded area.

Playgrounds can be

– Built by collaborative support of corporate and community resources to achieve an immediate and visible “win” for their neighborhood.
– Public, free of charge, like at most rural elementary schools
– A business with an entrance fee
– Connected to a business, for customers only, e.g., at McDonald’s and IKEA.
– Elaborate indoor mazes, like those at the (now defunct) Discovery Zone and Chuck E. Cheese’s
Playground safety

Sometimes the safety of playgrounds is disputed in school or among regulators. Over at least the last twenty years, the kinds of equipment to be found in playgrounds has changed, often towards safer equipment built with modern materials. For example, an older jungle gym might be constructed entirely from steel bars, while newer ones tend to have a minimal steel framework while providing a web of nylon ropes for children to climb on. Playgrounds with equipment that children may fall off often use mulch on the ground to help break their falls. Rubber mulch is gaining popularity due to its added ability to break falls.

A study done by the Canadian Institute for Health Information found that playground injuries were responsible for 23 visits a day to emergency rooms in Ontario, Canada. The largest proportion of these visits were for orthopedic and head injuries (51% and 22% respectively.)

In the United States the Consumer Product Safety Commission and the American National Standards Institute have created a Standardized Document and Training System for certification of Playground Safety Inspectors. These regulations are nation wide and provide a basis for safe playground installation and maintenance practices. ASTM F1487-07 deals with specific requirements regarding issues such as play ground layout, use zones, and various test criteria for determining play ground safety. ASTM F2373 covers public use play equipment for children 6-24 months old. This information can be applied effectively only by a trained C.P.S.I. A National Listing of Trained Playground Safety Inspectors is available for many states. A Certified Playground Safety Inspector (CPSI) is a career that was developed by the National Playground Safety Institute (NPSI) and is recognized nationally by the National Recreation and Park Association or N.R.P.A.

European Standards EN 1177 specifies the requirements for surfaces used in playgrounds. For each material type and height of equipment it specifies a minimum depth of material required. EN 1176 covers playground equipment standards.

In the UK playground inspectors can sit the examinations of the Register of Play Inspectors International (www.playinspectors.com) at the three required levels – routine, operational and annual. Annual inspectors are able to undertake the post-installation inspections recommended by EN 1176. For further information and downloads see The Play Inspection Company at www.playinspectors.com

Playgrounds in the Soviet Union

Playgrounds were an integral part of urban culture in the USSR. In the 1970s and 1980s there were playgrounds in almost every park in many Soviet cities. Playground apparatus was reasonably standard all over the country; most of them consisted of metallic bars with relatively few wooden parts, and were manufactured in state-owned factories. Some of the most common constructions were the carousel, sphere, seesaw, rocket, bridge, etc.

In the 1990s, after the breakup of the USSR, many items of playground apparatus in post-Soviet states were stolen by metal-thieves, while relatively few new playgrounds were built. However, there were so many Soviet playgrounds that many of them still exist and are in a relatively good state, especially those which were repainted.

Natural Playground

“Natural playgrounds” are play environments that blend natural materials, features, and indigenous vegetation with creative landforms to create purposely complex interplays of natural, environmental objects in ways that challenge and fascinate children and teach them about the wonders and intricacies of the natural world while they play within it.

Play components may include earth shapes (sculptures), environmental art, indigenous vegetation (trees, shrubs, grasses, flowers, lichens, mosses), boulders or other rock structures, dirt and sand, natural fences (stone, willow, wooden), textured pathways, and natural water features.

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Project management is the discipline of planning, organizing and managing resources to bring about the successful completion of specific project goals and objectives.

A project is a finite endeavor (having specific start and completion dates) undertaken to create a unique product or service which brings about beneficial change or added value. This finite characteristic of projects stands in sharp contrast to processes, or operations, which are permanent or semi-permanent functional work to repetitively produce the same product or service. In practice, the management of these two systems is often found to be quite different, and as such requires the development of distinct technical skills and the adoption of separate management philosophy, which is the subject of this article.

The primary challenge of project management is to achieve all of the project goals and objectives while honoring the project constraints. Typical constraints are scope, time and budget. The secondary—and more ambitious—challenge is to optimize the allocation and integration of inputs necessary to meet pre-defined objectives. A project is a carefully defined set of activities that use resources (money, people, materials, energy, space, provisions, communication, motivation, etc.) to achieve the project goals and objectives.

History of project management

As a discipline, Project Management developed from different fields of application including construction, engineering and defense. In the United States, the forefather of project management is Henry Gantt, called the father of planning and control techniques, who is famously known for his use of the Gantt chart as a project management tool, for being an associate of Frederick Winslow Taylor’s theories of scientific management, and for his study of the work and management of Navy ship building. His work is the forerunner to many modern project management tools including the work breakdown structure (WBS) and resource allocations.

The 1950s marked the beginning of the modern Project Management era. Again, in the United States, prior to the 1950s, projects were managed on an ad hoc basis using mostly Gantt Charts, and informal techniques and tools. At that time, two mathematical project scheduling models were developed:

(1) the “Program Evaluation and Review Technique” or PERT, developed by Booz-Allen & Hamilton as part of the United States Navy’s (in conjunction with the Lockheed Corporation) Polaris missile submarine program; and
(2) the “Critical Path Method” (CPM) developed in a joint venture by both DuPont Corporation and Remington Rand Corporation for managing plant maintenance projects. These mathematical techniques quickly spread into many private enterprises.

At the same time, technology for project cost estimating, cost management, and engineering economics was evolving, with pioneering work by Hans Lang and others. In 1956, the American Association of Cost Engineers (now AACE International; the Association for the Advancement of Cost Engineering) was formed by early practitioners of project management and the associated specialties of planning and scheduling, cost estimating, and cost/schedule control (project control). AACE has continued its pioneering work and in 2006 released the first ever integrated process for portfolio, program and project management (Total Cost Management Framework).

In 1969, the Project Management Institute (PMI) was formed to serve the interests of the project management industry. The premise of PMI is that the tools and techniques of project management are common even among the widespread application of projects from the software industry to the construction industry. In 1981, the PMI Board of Directors authorized the development of what has become A Guide to the Project Management Body of Knowledge (PMBOK Guide), containing the standards and guidelines of practice that are widely used throughout the profession.

The International Project Management Association (IPMA), founded in Europe in 1967, has undergone a similar development and instituted the IPMA Competence Baseline (ICB). The focus of the ICB also begins with knowledge as a foundation, and adds considerations about relevant experience, interpersonal skills, and competence. Both organizations are now participating in the development of an ISO project management standard.

Project management approaches

There are several approaches that can be taken to managing project activities including agile, interactive, incremental, and phased approaches.
Regardless of the approach employed, careful consideration needs to be given to clarify surrounding project objectives, goals, and importantly, the roles and responsibilities of all participants and stakeholders.

The traditional approach

A traditional phased approach identifies a sequence of steps to be completed. In the “traditional approach”, we can distinguish 5 components of a project (4 stages plus control) in the development of a project:

Typical development phases of a project:

– project initiation stage;
– project planning or design stage;
– project execution or production stage;
– project monitoring and controlling systems;
– project completion stage.

Not all the projects will visit every stage as projects can be terminated before they reach completion. Some projects probably don’t have the planning and/or the monitoring. Some projects will go through steps 2, 3 and 4 multiple times.

Many industries utilize variations on these stages. For example, in bricks and mortar architectural design, projects typically progress through stages like Pre-Planning, Conceptual Design, Schematic Design, Design Development, Construction Drawings (or Contract Documents), and Construction Administration. In software development, this approach is often known as “waterfall development”, i.e., one series of tasks after another in linear sequence. In software development many organizations have adapted the Rational Unified Process (RUP) to fit this methodology, although RUP does not require or explicitly recommend this practice. Waterfall development can work for small tightly defined projects, but for larger projects of undefined or unknowable scope, it is less suited. The Cone of Uncertainty explains some of this as the planning made on the initial phase of the project suffers from a high degree of uncertainty. This becomes specially true as software development is often the realization of a new or novel product, this method has been widely accepted as ineffective for software projects where requirements are largely unknowable up front and susceptible to change. While the names may differ from industry to industry, the actual stages typically follow common steps to problem solving — “defining the problem, weighing options, choosing a path, implementation and evaluation.”

Critical Chain Project Management

Critical Chain Project Management (CCPM) is a method of planning and managing projects that puts more emphasis on the resources required to execute project tasks. It is an application of the Theory of Constraints (TOC) to projects. The goal is to increase the rate of throughput (or completion rates) of projects in an organization. Applying the first three of the five focusing steps of TOC, the system constraint for all projects is identified as resources. To exploit the constraint, tasks on the critical chain are given priority over all other activities. Finally, projects are planned and managed to ensure that the critical chain tasks are ready to start as soon as the needed resources are available, subordinating all other resources to the critical chain.

For specific projects, the project plan should undergo Resource Leveling, and the longest sequence of resource-constrained tasks is identified as the critical chain. In multi-project environments, resource leveling should be performed across projects. However, it is often enough to identify (or simply select) a single “drum” resource—a resource that acts as a constraint across projects—and stagger projects based on the availability of that single resource.

Extreme Project Management

In critical studies of Project Management, it has been noted that several of these fundamentally PERT-based models are not well suited for the multi-project company environment of today. Most of them are aimed at very large-scale, one-time, non-routine projects, and nowadays all kinds of management are expressed in terms of projects.

Using complex models for “projects” (or rather “tasks”) spanning a few weeks has been proven to cause unnecessary costs and low maneuverability in several cases. Instead, project management experts try to identify different “lightweight” models, such as Agile Project Management methods including Extreme Programming for software development and Scrum techniques.
The generalization of Extreme Programming to other kinds of projects is extreme project management, which may be used in combination with the process modeling and management principles of human interaction management.

Event chain methodology

Event chain methodology is the next advance beyond critical path method and critical chain project management.

Event chain methodology is an uncertainty modeling and schedule network analysis technique that is focused on identifying and managing events and event chains that affect project schedules. Event chain methodology helps to mitigate the negative impact of psychological heuristics and biases, as well as to allow for easy modeling of uncertainties in the project schedules. Event chain methodology is based on the following major principles.

Probabilistic moment of risk: An activity (task) in most real life processes is not a continuous uniform process. Tasks are affected by external events, which can occur at some point in the middle of the task.

Event chains: Events can cause other events, which will create event chains. These event chains can significantly affect the course of the project. Quantitative analysis is used to determine a cumulative effect of these event chains on the project schedule.

Critical events or event chains: The single events or the event chains that have the most potential to affect the projects are the “critical events” or “critical chains of events.” They can be determined by the analysis.

Project tracking with events: If a project is partially completed and data about the project duration, cost, and events occurred is available, it is possible to refine information about future potential events and helps to forecast future project performance.

Event chain visualization: Events and event chains can be visualized using event chain diagrams on a Gantt chart.

PRINCE2

PRINCE2 is a structured approach to project management, released in 1996 as a generic project management method. It provides a method for managing projects within a clearly defined framework. PRINCE2 describes procedures to coordinate people and activities in a project, how to design and supervise the project, and what to do if the project has to be adjusted if it doesn’t develop as planned.

In the method each process is specified with its key inputs and outputs and with specific goals and activities to be carried out, which gives an automatic control of any deviations from the plan. Divided into manageable stages, the method enables an efficient control of resources. On the basis of close monitoring the project can be carried out in a controlled and organized way.

PRINCE2 provides a common language for all participants in the project. The various management roles and responsibilities involved in a project are fully described and are adaptable to suit the complexity of the project and skills of the organisation.

Process-based management

Also furthering the concept of project control is the incorporation of process-based management. This area has been driven by the use of Maturity models such as the CMMI (Capability Maturity Model Integration) and ISO/IEC15504 (SPICE – Software Process Improvement and Capability Determination), which have been far more successful.

Agile Project Management approaches based on the principles of human interaction management are founded on a process view of human collaboration. This contrasts sharply with traditional approach. In the agile software development or flexible product development approach, the project is seen as a series of relatively small tasks conceived and executed as the situation demands in an adaptive manner, rather than as a completely pre-planned process.

Rational Unified Process
The Rational Unified Process (RUP) is an iterative software development process framework created by the Rational Software Corporation, a division of IBM since 2003. RUP is not a single concrete prescriptive process, but rather an adaptable process framework, intended to be tailored by the development organizations and software project teams that will select the elements of the process that are appropriate for their needs. The following are phases of RUP, which align to business activities intended to drive successful delivery and deployment of projects. It also provides the taxonomy for blue printing and producing enterprise architecture artifacts across its different domains.

– Inception – Identify the initial scope of the project, a potential architecture for the system, and obtain initial project funding and stakeholder acceptance.
– Elaboration – Prove the architecture of the system.
– Construction – Build working software on a regular, incremental basis which meets the highest-priority needs of project stakeholders.
– Transition – Validate and deploy the system into the production environment

The open source version of RUP is OpenUP.

Project development stages

Traditionally, project development includes five elements: control systems, and four stages. Regardless of the methodology used, the project development process will have the same major stages:

– initiation
– planning or development
– production or execution
– monitoring and controlling, and
– closing

Project control systems

Project control is that element of a project that keeps it on-track, on-time and within budget. Project control begins early in the project with planning and ends late in the project with post-implementation review, having a thorough involvement of each step in the process. Each project should be assessed for the appropriate level of control needed: too much control is too time consuming, too little control is very risky. If project control is not implemented correctly, the cost to the business should be clarified in terms of errors, fixes, and additional audit fees.

Control systems are needed for cost, risk, quality, communication, time, change, procurement, and human resources. In addition, auditors should consider how important the projects are to the financial statements, how reliant the stakeholders are on controls, and how many controls exist. Auditors should review the development process and procedures for how they are implemented. The process of development and the quality of the final product may also be assessed if needed or requested. A business may want the auditing firm to be involved throughout the process to catch problems earlier on so that they can be fixed more easily. An auditor can serve as a controls consultant as part of the development team or as an independent auditor as part of an audit.

Businesses sometimes use formal systems development processes. These help assure that systems are developed successfully. A formal process is more effective in creating strong controls, and auditors should review this process to confirm that it is well designed and is followed in practice. A good formal systems development plan outlines:

– A strategy to align development with the organization’s broader objectives
– Standards for new systems
– Project management policies for timing and budgeting
– Procedures describing the process

Initiation

The initiation stage determines the nature and scope of the development. If this stage is not performed well, it is unlikely that the project will be successful in meeting the business’s needs. The key project controls needed here are an understanding of the business environment and making sure that all necessary controls are incorporated into the project. Any deficiencies should be reported and a recommendation should be made to fix them.

The initiation stage should include a cohesive plan that encompasses the following areas:

– Study analyzing the business needs in measurable goals.
– Review of the current operations.
– Conceptual design of the operation of the final product.
– Equipment and contracting requirements including an assessment of ‘long-lead’ items.
– Financial analysis of the costs and benefits including a budget.
– Stakeholder analysis, including users, and support personnel for the project.
– Project charter including costs, tasks, deliverables, and schedule.

Planning and design

After the initiation stage, the system is designed. Occasionally, a small prototype of the final product is built and tested. Testing is generally performed by a combination of testers and end users, and can occur after the prototype is built or concurrently. Controls should be in place that ensure that the final product will meet the specifications of the project charter. The results of the design stage should include a product design that:

– Satisfies the project sponsor, end user, and business requirements.
– Functions as it was intended.
– Can be produced within quality standards.
– Can be produced within time and budget constraints.

Executing

Executing consists of the processes used to complete the work defined in the project management plan to accomplish the project’s requirements. Execution process involves coordinating people and resources, as well as integrating and performing the activities of the project in accordance with the project management plan. The deliverables are produced as outputs from the processes performed as defined in the project management plan.

Monitoring and Controlling

Monitoring and Controlling consists of those processes performed to observe project execution so that potential problems can be identified in a timely manner and corrective action can be taken, when necessary, to control the execution of the project. The key benefit is that project performance is observed and measured regularly to identify variances from the project management plan.

Monitoring and Controlling includes:

– Measuring the ongoing project activities (where we are);
– Monitoring the project variables (cost, effort, …) against the project management plan and the project performance baseline (where we should be);
– Identify corrective actions to properly address issues and risks (How can we get on track again);

Influencing the factors that could circumvent integrated change control so only approved changes are implemented in multi-phase projects, the Monitoring and Controlling process also provides feedback between project phases, in order to implement corrective or preventive actions to bring the project into compliance with the project management plan.

Project Maintenance is an ongoing process, and it includes:

– Continuing support of end users
– Correction of errors
– Updates of the software over time

In this stage, auditors should pay attention to how effectively and quickly user problems are resolved.

Over the course of any construction project, the work scope changes. Change is a normal and expected part of the construction process. Changes can be the result of necessary design modifications, differing site conditions, material availability, contractor-requested changes, value engineering and impacts from third parties, to name a few. Beyond executing the change in the field, the change normally needs to be documented to show what was actually constructed. This is referred to as Change Management. Hence, the owner usually requires a final record to show all changes or, more specifically, any change that modifies the tangible portions of the finished work. The record is made on the contract documents – usually, but not necessarily limited to, the design drawings. The end product of this effort is what the industry terms as-built drawings, or more simply, “as-builts.” The requirement for providing them is a norm in construction contracts.

When changes are introduced to the project the viability of the project has to be assessed again. It is important not to lose sight of the initial goals and targets of the projects. When the changes accumulate, the forecasted end result may not justify the proposed investment.

Closing

Closing includes the formal acceptance of the project and the ending thereof. Administrative activities include the archiving of the files and documenting lessons learned. Closing phase consist of two parts:

– Close project: to finalize all activities across all of the process groups to formally close the project or a project phase
– Contract closure: necessary for completing and settling each contract, including the resolution of any open items, and closing each contract applicable to the project or a project phase.

Project management topics

Project managers

A project manager is a professional in the field of project management. Project managers can have the responsibility of the planning, execution, and closing of any project, typically relating to construction industry, architecture, computer networking, telecommunications or software development. Many other fields in the production, design and service industries also have project managers.

A project manager is the person accountable for accomplishing the stated project objectives. Key project management responsibilities include creating clear and attainable project objectives, building the project requirements, and managing the triple constraint for projects, which is cost, time, and scope.

A project manager is often a client representative and has to determine and implement the exact needs of the client, based on knowledge of the firm they are representing. The ability to adapt to the various internal procedures of the contracting party, and to form close links with the nominated representatives, is essential in ensuring that the key issues of cost, time, quality and above all, client satisfaction, can be realized.

Project Management Triangle

Like any human undertaking, projects need to be performed and delivered under certain constraints. Traditionally, these constraints have been listed as “scope,” “time,” and “cost”. These are also referred to as the “Project Management Triangle,” where each side represents a constraint. One side of the triangle cannot be changed without affecting the others. A further refinement of the constraints separates product “quality” or “performance” from scope, and turns quality into a fourth constraint.

The time constraint refers to the amount of time available to complete a project. The cost constraint refers to the budgeted amount available for the project. The scope constraint refers to what must be done to produce the project’s end result. These three constraints are often competing constraints: increased scope typically means increased time and increased cost, a tight time constraint could mean increased costs and reduced scope, and a tight budget could mean increased time and reduced scope.

The discipline of Project Management is about providing the tools and techniques that enable the project team (not just the project manager) to organize their work to meet these constraints.

Work Breakdown Structure

The Work Breakdown Structure (WBS) is a tree structure, which shows a subdivision of effort required to achieve an objective; for example a program, project, and contract. The WBS may show hardware, product, service, or process oriented. In a project of contract, the WBS is developed by starting with:

– the end objective and
– successively subdividing it into manageable components in terms of size, duration, and responsibility (e.g., systems, subsystems, components, tasks, subtasks, and work packages) which include all steps necessary to achieve the objective.

The Work Breakdown Structure provides a common framework for the natural development of the overall planning and control of a contract and is the basis for dividing work into definable increments from which the statement of work can be developed and technical, schedule, cost, and labor hour reporting can be established.

Project control variables

Project Management tries to gain control over variables such as risk. Potential points of failure: Most negative risks (or potential failures) can be overcome or resolved, given enough planning capabilities, time, and resources. According to some definitions (including PMBOK Third Edition) risk can also be categorized as “positive–” meaning that there is a potential opportunity, e.g., complete the project faster than expected.

Customers (either internal or external project sponsors) and external organizations (such as government agencies and regulators) can dictate the extent of three variables: time, cost, and scope. The remaining variable (risk) is managed by the project team, ideally based on solid estimation and response planning techniques. Through a negotiation process among project stakeholders, an agreement defines the final objectives, in terms of time, cost, scope, and risk, usually in the form of a charter or contract.

To properly control these variables a good project manager has a depth of knowledge and experience in these four areas (time, cost, scope, and risk), and in six other areas as well: integration, communication, human resources, quality assurance, schedule development, and procurement.

International standards

There have been several attempts to develop Project Management standards, such as:

– A Guide to the Project Management Body of Knowledge
– HERMES method, Swiss general project management method, selected for use in Luxembourg and international organisations.
– The ISO standards ISO 9000, a family of standards for quality management systems, and the ISO 10006:2003, for Quality management systems and guidelines for quality management in projects.
– Organizational Project Management Maturity Model
– PRINCE2, PRojects IN Controlled Environments.
– Capability Maturity Model from the Software Engineering Institute.
– Total Cost Management Framework, an AACE International’s process for Portfolio, Program and Project Management)
– V-Modell, an originally systems development method.

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Rock climbing is a sport in which participants climb up or across natural rock formations or man-made rock walls with the goal of reaching the summit of a formation or the endpoint of a pre-defined route. Rock climbing is similar to scrambling (another activity involving the scaling of hills and similar formations), but climbing is generally differentiated by its need for the use of the climber’s hands to hold his or her own weight and not just provide balance.

Rock climbing is a physically and mentally demanding sport, one that often tests a climber’s strength, endurance, agility, and balance along with his or her mental control. It can be a dangerous sport and knowledge of proper climbing techniques and usage of specialized climbing equipment is crucial for the safe completion of routes. The wide variety of rock formations around the world has led rock climbing to separate into several different styles and sub-disciplines that are described below.

History

Although rock climbing was an important component of Victorian mountaineering in the Alps, it is generally thought that the sport of rock climbing began in the last quarter of the nineteenth century in various parts of Europe. Rock climbing evolved gradually from an alpine necessity to a distinct athletic activity.

Aid climbing (climbing using equipment that act as artificial hand- or footholds) became popular during the period 1920 – 1960, leading to ascents in the Alps and in Yosemite Valley that were considered impossible without such means. However, climbing techniques, equipment, and ethical considerations have evolved steadily, and today, free climbing (climbing on holds made entirely of natural rock, using gear solely for protection and not for support) is the most popular form of the sport. Free climbing has since been divided into several sub-styles of climbing dependent on belay configuration (described below).

Over time, grading systems have also been created in order to more accurately compare the relative difficulties of climbs.

Rock climbing basics

At its most basic, rock climbing involves climbing a route with one’s own hands and feet and little more than a cushioned bouldering pad in the way of protection. This style of climbing is referred to as bouldering, since the relevant routes are usually found on boulders no more than 10 to 15 feet tall.

As routes get higher off the ground, the increased risk of life-threatening injuries necessitates additional safety measures. A variety of specialized climbing techniques and climbing equipment exists to provide that safety, and climbers will usually work in pairs and utilize a system of ropes and anchors designed to catch falls. Ropes and anchors can be configured differently to suit many styles of climbing, and roped climbing is thus divided into further sub-types that vary based on how their belay systems are set up. The different styles are described in more detail below, but, generally speaking, beginners will start with top roping and/or easy bouldering, and work their way up to lead climbing and beyond.

In toproping, an anchor is set up at the summit of a route prior to the start of a climb. Rope is run through the anchor; one end attaches to the climber and the other to the belayer, who keeps the rope taut during the climb and prevents long falls.

In lead climbing, one person, called the “leader”, will climb from the ground up with rope directly attached (and not through a top anchor) while the other, called the “second”, belays the leader. Because the climbing rope is of a fixed length, the leader can only climb a certain distance. Thus longer routes are broken up into several “pitches”. At the top of a pitch, the leader sets up an anchor, and then belays the “second” up to the anchor. Once both are at the anchor, the leader begins climbing the next pitch and so on until they reach the top.

In either case, upon completion of a route, climbers can walk back down (if an alternate descent path exists) or rappel (abseil) down with the rope.

Climbing communities in many countries and regions have developed their own rating systems for routes. Ratings (or “grades”) record and communicate consensus appraisals of difficulty. (Hence, there may be occasional disagreements arising from anatomical differences among climbers.) The ratings take into account multiple factors affecting a route, such as the slope of the ascent, the quantity and quality of available handholds, the distance between holds, and whether advanced technical maneuvers are required. Though acrophobia (the fear of heights) may affect certain climbers, the height of a route is generally not considered a factor in its difficulty rating.

Climbs can occur either outdoors on varying types of rock or indoors on specialized climbing walls. Outdoors, climbs usually take place on sunny days when the holds are dry and provide the best grip, but climbers can also attempt to climb at night or in adverse weather conditions if they have the proper training and equipment.

Styles of rock climbing

Most of the climbing done in modern times is considered free climbing — climbing using one’s own physical strength with equipment used solely as protection and not as support — as opposed to aid climbing, the gear-dependent form of climbing that was dominant in the sport’s earlier days. Free climbing is typically divided into several styles that differ from one another depending on the equipment used and the configurations of their belay, rope, and anchor systems (or the lack thereof).

Bouldering is climbing on short, low routes without the use of the safety rope that is typical of most other styles. Protection, if used at all, typically consists of a cushioned bouldering pad below the route and/or a spotter, a person that watches from below and directs the fall of the climber away from hazardous areas. Bouldering may be an arena for intense and relatively safe competition, resulting in exceptionally high difficulty standards.

Top roping is climbing with the protection of a rope that’s already suspended through an anchor at the top of a route. A belayer controls the rope, keeping it taut, and prevents long falls.

Lead climbing is climbing without the use of pre-set belays. One person (the leader) will start the climb carrying one end of the rope and will gradually attach it to additional anchors as he or she climbs, thereby establishing a belay system that progresses with the climb. Subtypes of lead climbing are trad climbing and sport climbing.

Free soloing (not to be confused with free climbing) is single-person climbing without the use of any rope or protection system whatsoever. If a fall occurs and the climber is not over water (as in the case of deep water soloing), the climber is likely to be killed or seriously injured. Though technically similar to bouldering, free solo climbing typically refers to routes that are far taller and/or far more lethal.

Indoor climbing is climbing indoors (on a purpose-made climbing wall), whether bouldering, top-roping, or lead climbing. This is sometimes used as training for outside climbing, though some climbers climb indoors exclusively. Indoor climbing is considered to be extremely safe and most facilities report little to no major injuries.

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A shopping mall or shopping centre is a building or set of buildings that contain retail units, with interconnecting walkways enabling visitors to easily walk from unit to unit.

Strip malls have developed since the 1920s, corresponding to the rise of suburban living in the United States after World War II. As such, the strip mall development has been the subject of the same criticisms leveled against suburbanisation and suburban sprawl in general. In the United Kingdom, these are called retail parks, out-of-town shopping centres, or precincts.

Regional differences

In most of the world the term shopping centre is used, especially in Europe and Australasia; however shopping mall is also used, predominantly in North America. Shopping precinct and shopping arcade are also used. In North America, the term shopping mall is usually applied to enclosed retail structures (and may be abbreviated to simply mall) while shopping centre usually refers to open-air retail complexes.

Malls in Ireland, pronounced “maills”, are very small shopping centres placed in the centre of town. They average about twenty years in age, with a mix of local shops and chain stores. These malls do not have shops found in the high street or modern shopping centres.

Shopping centres in the United Kingdom can be referred to as “shopping centres”, “shopping precincts” or just “precincts”, but with American-style centres becoming more common in the UK, the term “mall” is gradually growing in use, at least among the younger generation.

History

Isfahan’s Grand Bazaar, which is largely covered, dates from the 10th century A.D. The 10 kilometer long covered Tehran’s Grand Bazaar also has a long history. The Grand Bazaar of Istanbul was built in 15th century and is still one of the largest covered markets in the world with more than 58 streets and 4000 shops.

Gostiny Dvor in Saint Petersburg, which opened in 1785, should probably be regarded as one of the first purposely-built shopping malls in the world, as it consisted of more than 100 shops covering an area of over 53,000 m².

The Oxford Covered Market in Oxford, England was opened in 1774 and still runs today.

The Burlington Arcade in London was opened in 1819. The Arcade in Providence, Rhode Island introduced the concept to the United States in 1828. The Galleria Vittorio Emanuele II in Milan, Italy followed in the 1860s and is closer to large modern malls in spaciousness. Other large cities created arcades and shopping centres in the late 19th century and early 20th century, including the Cleveland Arcade and Moscow’s GUM in 1890. Early shopping centers designed for the automobile include Market Square, Lake Forest, Illinois (1916) and Country Club Plaza, Kansas City, Missouri (1924).

An early indoor mall in the United States was the Lake View Store at Morgan Park, Duluth, Minnesota, which was built in 1915 and held its grand opening on July 20, 1916. The architect was Dean and Dean from Chicago and the building contractor was George H. Lounsberry from Duluth. The building is two-stories with a full basement and shops were originally located on all three levels. All of the stores were located within the interior of the mall with some shops being accessible from both inside and out.

In the mid-20th century, with the rise of the suburb and automobile culture in the United States, a new style of shopping centre was created away from downtown.

Early shopping centers

An early shopping center in the United States was Country Club Plaza, which opened in 1924 in Kansas City, Missouri. Other important shopping centers built in the 1920s and early 1930s are the Highland Park Village in Dallas, Texas; River Oaks in Houston, Texas; and Park and Shop in Washington, DC.

However, the concept of the fully-enclosed shopping mall did not appear until the 1950s. The idea was pioneered by the Austrian-born architect and American immigrant Victor Gruen. This new generation, that were eventually called malls, included Northgate Mall, built in north Seattle, Washington, USA in 1950, Victor Gruen’s Northland Shopping Center built near Detroit, Michigan, USA in 1954, and Gulfgate Mall in Houston were all originally open-air pedestrian shopping centers that later were enclosed as malls. The first enclosed, postwar shopping center (or mall) was the Gruen-designed Southdale Center, which opened in the Twin Cities suburb of Edina, Minnesota, USA in 1956. These malls moved retailing away from the dense, commercial downtown into the largely residential suburbs. This formula (of enclosed space with stores attached, away from downtown, and accessible only by automobile) became a popular way to build retail across the world. In the UK, Chrisp Street Market was the first pedestrian shopping area built with a road at the shop fronts.

The Bergen Mall, the oldest enclosed mall in New Jersey, opened in Paramus on November 14, 1957, with Dave Garroway, host of The Today Show, serving as master of ceremonies. The mall, located just outside New York City, was planned in 1955 by Allied Stores to have 100 stores and 8,600 parking spaces in a 1.5 million ft² mall that would include a 300,000 ft² Stern’s store and two other 150,000 ft² department stores as part of the design. Allied’s chairman B. Earl Puckett confidently announced the Bergen Mall as the largest of ten proposed centers, stating that there were 25 cities that could support such centers and that no more than 50 malls of this type would ever be built nationwide.

Largest shopping malls

Two of the largest malls in the world are in China, South China Mall and Jin Yuan. Dubai Mall is the largest mall in Middle East and Europe, currently ranked 7th in the world. Previously, the title of the largest enclosed shopping mall was with the West Edmonton Mall in Edmonton, Alberta, Canada from 1986–2004. It is now the eighth largest mall in the world.

One of the world’s largest shopping complexes at one location is the two-mall agglomeration of the Plaza at King of Prussia and the Court at King of Prussia in the Philadelphia suburb of King of Prussia, Pennsylvania, USA. The King of Prussia mall has the most shopping per square foot in the US. The most visited shopping mall in the world and largest mall in the United States is the Mall of America, located near the Twin Cities in Bloomington, Minnesota, USA. However, several Asian malls are advertised as having more visitors, including Mal Taman Anggrek, Kelapa Gading Mall and Megamal Pluit, all in Jakarta-Indonesia, Berjaya Times Square in Malaysia and SM Megamall in the Philippines.

Beijing’s (Peking) Golden Resources Mall, which opened in October 2004, is the world’s second largest mall, at 600,000 m² (approximately 6 million square ft). Berjaya Times Square in Kuala Lumpur, Malaysia, is advertised at 700,000 square metres (7,530,000 sq ft). SM City North EDSA in the Philippines, which opened in November 1985, is the world’s third largest at 460,000 square metres (4,951,400 sq ft) of gross floor area, and SM Mall of Asia in the Philippines, opened in May 2006, is the world’s 4th largest at 386,000 square metres (4,154,900 sq ft) of gross floor area.

Pitt Street Mall” of Sydney is Australia’s busiest shopping precinct. This mall has eight retail centres and more than 600 speciality stores, within two city blocks.

British usage

A mall can refer to a shopping mall, which is a place where a collection of shops all adjoin a pedestrian area, or an exclusively pedestrian street, that allows shoppers to walk without interference from vehicle traffic. Mall is generally used in North America and Australasia to refer to a large shopping area usually composed of a single building which contains multiple shops, usually “anchored” by one or more department stores surrounded by a parking lot, while the term arcade is more often used, especially in Britain, to refer to a narrow pedestrian-only street, often covered or between closely spaced buildings (see town centre). A larger, often only partly covered but exclusively pedestrian shopping area is in Britain also termed a “shopping centre”, shopping precinct or pedestrian precinct.

The majority of British shopping centres are in town centres, usually inserted into old shopping districts, and surrounding by subsidiary open air shopping streets. A number of large out-of-town “regional malls” such as Meadowhall, Sheffield and the Trafford Centre, Manchester were built in the 1980s and 1990s, but there are only ten of them or so and planning regulations prohibit the construction of any more. Out-of-town shopping developments in the UK are now focused on retail parks, which consist of groups of warehouse style shops with individual entrances from outdoors. Planning policy prioritizes the development of existing town centres, although with patchy success. The Metro centre, Gateshead, is the largest shopping centre in Europe with over 330 shops, 50 restaurants and an 11 screen cinema, while the Westfield London is the largest inner-city shopping centre in Europe.

Classes of malls

In many cases, regional and super-regional malls exist as parts of large superstructures which often also include office space, residential space, amusement parks and so forth. This trend can be seen in the construction and design of many modern supermalls such as Cevahir Mall in Turkey. The International Council of Shopping Centers’ 1999 definitions were not restricted to shopping centers in any particular country, but later editions were made specific to the U.S. with a separate set for Europe.

Regional malls

A regional mall is, per the International Council of Shopping Centers, in the United States, a shopping mall which is designed to service a larger area than a conventional shopping mall. As such, it is typically larger with 400,000 square feet (37,000 m2) to 800,000 square feet (74,000 m2) gross leasable area with at least two anchors and offers a wider selection of stores. Given their wider service area, these malls tend to have higher-end stores that need a larger area in order for their services to be profitable. Regional malls are also found as tourist attractions in vacation areas.

Super-regional malls
A super-regional mall is, per the ICSC, in the U.S. a shopping mall with over 800,000 square feet (74,000 m2) of gross leasable area, and which serves as the dominant shopping venue for the region in which it is located.

Outlet malls

An outlet mall (or outlet centre) is a type of shopping mall in which manufacturers sell their products directly to the public through their own stores. Other stores in outlet malls are operated by retailers selling returned goods and discontinued products, often at heavily reduced prices. Outlet stores were found as early as 1936, but the first multi-store outlet mall, Vanity Fair, located in Reading, PA didn’t open until 1974. Belz Enterprises opened the first enclosed factory outlet mall in 1979, in Lakeland, TN, a suburb of Memphis.

Components

Food court

A shopping mall food court consists of food vendors offering a selection of food. At a typical food court, food is ordered at one of the vendors and then consumed at a seating area, which is normally a plaza surrounded by the counters of the multiple food vendors.

Department stores

When the shopping mall format was developed by Victor Gruen in the mid-1950s, signing larger department stores was necessary for the financial stability of the projects, and to draw retail traffic that would result in visits to the smaller stores in the mall as well. These larger stores are termed anchor store or draw tenant. Anchors generally have their rents heavily discounted, and may even receive cash inducements from the mall to remain open. In physical configuration, anchor stores are normally located as far from each other as possible to maximize the amount of traffic from one anchor to another.

Dead malls

In the U.S, as more modern facilities are built, many early malls have become abandoned, due to decreased traffic and tenancy. These “dead malls” have failed to attract new business and often sit unused for many years until restored or demolished. Interesting examples of architecture and urban design, these structures often attract people who explore and photograph them. This phenomenon of dead and dying malls is examined in detail by the website Deadmalls.com, which hosts many such photographs, as well as historical accounts. Until the mid-1990s, the trend was to build enclosed malls and to renovate older outdoor malls into enclosed ones. Such malls had advantages such as temperature control. Since then, the trend has turned and it is once again fashionable to build open-air malls. According to the International Council of Shopping Centers (ICSC), only one enclosed mall has been built in the United States since 2006.

Some enclosed malls have been opened up, such as the Sherman Oaks Galleria. In addition, some malls, when replacing an empty anchor location, have replaced the former anchor store building with the more modern outdoor design, leaving the remainder of the indoor mall intact, such as the Del Amo Fashion Center in Torrance, California.

The Mall, an out-of-town shopping centre at Patchway, near Bristol, England. Escalators connect the upper and lower levels.

New trends

In parts of Canada, it is now rare for new shopping malls to be built, as outdoor outlet malls or big box shopping areas known as power centres are now favored, although the traditional enclosed shopping mall is still in demand by those seeking weather-protected, all-under-one-roof shopping. In addition the enclosed interconnections between downtown multi story shopping malls continue to grow in the Underground city of Montreal (32 kilometres of passageway), the PATH system of Toronto (27 km of passageway) and the Plus15 system of Calgary (16 km of overhead passageway).

Vertical malls

Due to the high land price in densely populated conurbations such as Hong Kong and Bangkok, and the higher yield on retail property, the “vertical mall” is common – Times Square (Hong Kong) is considered the first of its kind. The concept of the vertical mall departs from the common western model of the flat shopping mall: space allocated to retail is configured over a number of storeys accessible by escalators linking the different levels of the mall. The challenge of this type of mall is to overcome the natural tendency of shoppers to move horizontally and encourage shoppers to move upwards and downwards.

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Spatial planning refers to the methods used by the public sector to influence the distribution of people and activities in spaces of various scales. Spatial planning includes all levels of land use planning including urban planning, regional planning, environmental planning, national spatial plans, and in the European Union international levels.

There are numerous definitions of spatial planning. One of the earliest definitions comes from the European Regional/Spatial Planning Charter (often called the ‘Torremolinos Charter’), adopted in 1983 by the European Conference of Ministers responsible for Regional Planning (CEMAT): “Regional/spatial planning gives geographical expression to the economic, social, cultural and ecological policies of society. It is at the same time a scientific discipline, an administrative technique and a policy developed as an interdisciplinary and comprehensive approach directed towards a balanced regional development and the physical organisation of space according to an overall strategy.”

Numerous planning systems exist around the world. Especially in Northwestern Europe spatial planning has evolved greatly since the late 1950s.

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Strategic planning is an organization’s process of defining its strategy, or direction, and making decisions on allocating its resources to pursue this strategy, including its capital and people. Various business analysis techniques can be used in strategic planning, including SWOT analysis (Strengths, Weaknesses, Opportunities, and Threats ) and PEST analysis (Political, Economic, Social, and Technological analysis) or STEER analysis involving Socio-cultural, Technological, Economic, Ecological, and Regulatory factors.

Introduction

Strategies are different from tactics in that:

1. They are proactive and not re-active as tactics are.
2. They are internal in source, and the business venture has absolute control over their application.
3. Strategy can only be applied once, after that it is process of application with no unique element remaining.
4. The outcome is normally a strategic plan which is used as guidance to define functional and divisional plans, including Technology, Marketing, etc.

Strategic planning is the formal consideration of an organization’s future course. All strategic planning deals with at least one of three key questions:

– “What do we do?”
– “For whom do we do it?”
– “How do we excel?”

In business strategic planning, the third question is better phrased “How can we beat or avoid competition?”. (Bradford and Duncan, page 1).

In many organizations, this is viewed as a process for determining where an organization is going over the next year or more -typically 3 to 5 years, although some extend their vision to 20 years.

In order to determine where it is going, the organization needs to know exactly where it stands, then determine where it wants to go and how it will get there. The resulting document is called the “strategic plan”.

It is also true that strategic planning may be a tool for effectively plotting the direction of a company; however, strategic planning itself cannot foretell exactly how the market will evolve and what issues will surface in the coming days in order to plan your organizational strategy. Therefore, strategic innovation and tinkering with the ‘strategic plan’ have to be a cornerstone strategy for an organization to survive the turbulent business climate.

Vision, mission and values

Vision: Defines the desired or intended future state of a specific organization or enterprise in terms of its fundamental objective and/or strategic direction.

Mission: Defines the fundamental purpose of an organization or an enterprise, basically describing why it exists.

Values: Beliefs that are shared among the stakeholders of an organization. Values drive an organization’s culture and priorities.

Methodologies

There are many approaches to strategic planning but typically a three-step process may be used:

– Situation – evaluate the current situation and how it came about.
– Target – define goals and/or objectives (sometimes called ideal state)
– Path – map a possible route to the goals/objectives

One alternative approach is called Draw-See-Think

– Draw – what is the ideal image or the desired end state?
– See – what is today’s situation? What is the gap from ideal and why?
– Think – what specific actions must be taken to close the gap between today’s situation and the ideal state?
– Plan – what resources are required to execute the activities?

An alternative to the Draw-See-Think approach is called See-Think-Draw

– See – what is today’s situation?
– Think – define goals/objectives
– Draw – map a route to achieving the goals/objectives

In other terms strategic planning can be as follows:

– Vision – Define the vision and set a mission statement with hierarchy of goals
– SWOT – Analysis conducted according to the desired goals
– Formulate – Formulate actions and processes to be taken to attain these goals
– Implement – Implementation of the agreed upon processes
– Control – Monitor and get feedback from implemented processes to fully control the operation

Situational analysis

When developing strategies, analysis of the organization and its environment as it is at the moment and how it may develop in the future, is important. The analysis has to be executed at an internal level as well as an external level to identify all opportunities and threats of the external environment as well as the strengths and weaknesses of the organizations.

There are several factors to assess in the external situation analysis:

– Markets (customers)
– Competition
– Technology
– Supplier markets
– Labor markets
– The economy
– The regulatory environment

It is rare to find all seven of these factors having critical importance. It is also uncommon to find that the first two – markets and competition – are not of critical importance. (Bradford “External Situation – What to Consider”)

Analysis of the external environment normally focuses on the customer. Management should be visionary in formulating customer strategy, and should do so by thinking about market environment shifts, how these could impact customer sets, and whether those customer sets are the ones the company wishes to serve.

Analysis of the competitive environment is also performed, many times based on the framework suggested by Michael Porter.

Goals, objectives and targets

Strategic planning is a very important business activity. It is also important in the public sector areas such as education. It is practiced widely informally and formally. Strategic planning and decision processes should end with objectives and a roadmap of ways to achieve those objectives.

The following terms have been used in strategic planning: desired end states, plans, policies, goals, objectives, strategies, tactics and actions. Definitions vary, overlap and fail to achieve clarity. The most common of these concepts are specific, time bound statements of intended future results and general and continuing statements of intended future results, which most models refer to as either goals or objectives (sometimes interchangeably).

One model of organizing objectives uses hierarchies. The items listed above may be organized in a hierarchy of means and ends and numbered as follows: Top Rank Objective (TRO), Second Rank Objective, Third Rank Objective, etc. From any rank, the objective in a lower rank answers to the question “How?” and the objective in a higher rank answers to the question “Why?” The exception is the Top Rank Objective (TRO): there is no answer to the “Why?” question. That is how the TRO is defined.

People typically have several goals at the same time. “Goal congruency” refers to how well the goals combine with each other. Does goal A appear compatible with goal B? Do they fit together to form a unified strategy? “Goal hierarchy” consists of the nesting of one or more goals within other goal(s).

One approach recommends having short-term goals, medium-term goals, and long-term goals. In this model, one can expect to attain short-term goals fairly easily: they stand just slightly above one’s reach. At the other extreme, long-term goals appear very difficult, almost impossible to attain. Strategic management jargon sometimes refers to “Big Hairy Audacious Goals” (BHAGs) in this context. Using one goal as a stepping-stone to the next involves goal sequencing. A person or group starts by attaining the easy short-term goals, then steps up to the medium-term, then to the long-term goals. Goal sequencing can create a “goal stairway”. In an organizational setting, the organization may co-ordinate goals so that they do not conflict with each other. The goals of one part of the organization should mesh compatibly with those of other parts of the organization.

Mission statements and vision statements

Organizations sometimes summarize goals and objectives into a mission statement and/or a vision statement:

While the existence of a shared mission is extremely useful, many strategy specialists question the requirement for a written mission statement. However, there are many models of strategic planning that start with mission statements, so it is useful to examine them here.

A Mission statement tells you the fundamental purpose of the organization. It concentrates on the present. It defines the customer and the critical processes. It informs you of the desired level of performance.

A Vision statement outlines what the organization wants to be. It concentrates on the future. It is a source of inspiration. It provides clear decision-making criteria.

Many people mistake vision statement for mission statement. The Vision describes a future identity while the Mission serves as an ongoing and time-independent guide. The Mission describes why it is important to achieve the Vision. A Mission statement defines the purpose or broader goal for being in existence or in the business and can remain the same for decades if crafted well. A Vision statement is more specific in terms of both the future state and the time frame. Vision describes what will be achieved if the organization is successful.

A mission statement can resemble a vision statement in a few companies, but that can be a grave mistake. It can confuse people. The vision statement can galvanize the people to achieve defined objectives, even if they are stretch objectives, provided the vision is SMART (Specific, Measurable, Achievable, Relevant and Timebound). A mission statement provides a path to realize the vision in line with its values. These statements have a direct bearing on the bottom line and success of the organization.

Which comes first? The mission statement or the vision statement? That depends. If you have a new start up business, new program or plan to re engineer your current services, then the vision will guide the mission statement and the rest of the strategic plan. If you have an established business where the mission is established, then many times, the mission guides the vision statement and the rest of the strategic plan. Either way, you need to know your fundamental purpose – the mission, your current situation in terms of internal resources and capabilities (strengths and/or weaknesses) and external conditions (opportunities and/or threats), and where you want to go – the vision for the future. It’s important that you keep the end or desired result in sight from the start.

Features of an effective vision statement include:

– Clarity and lack of ambiguity
– Vivid and clear picture
– Description of a bright future
– Memorable and engaging wording
– Realistic aspirations
– Alignment with organizational values and culture

To become really effective, an organizational vision statement must (the theory states) become assimilated into the organization’s culture. Leaders have the responsibility of communicating the vision regularly, creating narratives that illustrate the vision, acting as role-models by embodying the vision, creating short-term objectives compatible with the vision, and encouraging others to craft their own personal vision compatible with the organization’s overall vision. In addition, mission statements need to conduct an internal assessment and an external assessment. The internal assessment should focus on how members inside the organization interpret their mission statement. The external assessment — which includes all of the businesses stakeholders — is valuable since it offers a different perspective. These discrepancies between these two assessments can give insight on the organization’s mission statement effectiveness.

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A swimming pool, swimming bath, wading pool, or simply a pool, is an artificially enclosed body of water intended for swimming or water-based recreation. There are many standard sizes; the largest and deepest is the Olympic size. A pool can be built either above or in the ground, and from materials such as metal, plastic or concrete.

Pools that may be used by many people or by the general public are called public, while pools used exclusively by a few people or in a home are called private. Many health clubs, fitness centers and private clubs have public pools used mostly for exercise. Many hotels and massage parlors have public pools for relaxation. Hot tubs and spas are pools with hot water, used for relaxation or therapy, and are common in homes, hotels, clubs and massage parlors.

Swimming pools are also used for diving, other sports, and training of lifeguards and astronauts.

Pools must be sanitized to prevent growth and spread of bacteria, viruses, algae and insect larvae that can cause disease. This is done by using filters and chemical disinfectants such as chlorine, bromine or mineral sanitizers.

History
The “great bath” at the site of Mohenjo-Daro was most likely dug during the 3rd millennium BC. This pool is 12 by 7 meters, is lined with bricks and was covered with a tar-based sealant.

Ancient Greeks and Romans built artificial pools for athletic training in the palaestras, for nautical games and for military exercises. Roman emperors had private swimming pools in which fish were also kept, hence one of the Latin words for a pool, piscina. The first heated swimming pool was built by Gaius Maecenas of Rome in the first century BC. Gaius Maecenas was a rich Roman lord and considered one of the first patrons of arts.

Ancient Sinhalese built pairs of pools called “Kuttam Pokuna” in the kingdom of Anuradhapura, Sri Lanka in 4th century BC. Those were decorated with flights of steps, punkalas or pots of abundance and scroll design.

Swimming pools became popular in Britain in the mid 19th century. By 1837, six indoor pools with diving boards were built in London, England. After the modern Olympic Games began in 1896 and included swimming races, the popularity of swimming pools began to spread (reference: Encyclopedia Britannica). In 1939, Oxford had its first major public indoor pool at Temple Cowley, and swimming began to take off. The Amateur Swimming Association was founded in 1869 in England, and the Oxford Swimming Club in 1909 with its home at Temple Cowley Pool. The presence of indoor baths in the cobbled area of Merton Street, London may have persuaded the less hardy of the aquatic brigade to join. So, bathers gradually became swimmers, and bathing pools swimming pools.

Deep Eddy Pool, built in 1915, is the oldest concrete swimming pool in Texas, United States
In the USA, the Racquet Club of Philadelphia clubhouse (1907) boasts one of the world’s first modern above-ground swimming pools. The first swimming pool to go to sea on an ocean liner was installed on the White Star Line’s Adriatic in 1907.

After World War I and the departure of “Long John” style swimming costumes, interest in competitive swimming grew. Standards improved and training became essential.

Home swimming pools became popular in the USA after World War II and the publicity given to swimming sports by Hollywood films like Esther Williams Million Dollar Mermaid made a home pool a desirable status symbol. More than 50 years later, the home or residential swimming pool is ubiquitous and even the smallest world nations enjoy a thriving swimming pool industry (e.g. New Zealand pop. 4,116,900 [Source NZ Census 7 March 2006] – holds the record in pools per capita with 65,000 home swimming pools and 125,000 spa pools).

Swimming pool records

One of the largest swimming pools ever built was reputedly in Moscow after the Palace of Soviets remained uncompleted. The foundations were converted into an open air swimming pool after the process of de-Stalinisation. After the fall of communism, Christ the Saviour Cathedral was re-built (it had originally been on the site) between 1995 and 2000.

According to the Guinness World Records, the largest swimming pool in the world is San Alfonso del Mar Seawater pool in Algarrobo, Chile. It is 1,013 m (3,324 ft) long and has an area of 8 ha (20 acres). It was completed in December 2006.

The largest indoor wave pool in North America is at the West Edmonton Mall and the largest indoor pool is at the Neutral Buoyancy Lab in the Sonny Carter Training Facility at NASA JSC in Houston. The recreational diving center Nemo 33 near Brussels, Belgium is home to the world’s deepest swimming pool. The pool has two large flat-bottomed areas at depth levels of 5 m (16 ft) and 10 m (32 ft), and a large circular pit descending to a depth of 33 m (108 ft).

The Fleishhacker Pool in San Francisco, California was the largest swimming pool in the United States. Opened on 23 April 1925, it measured 300 m by 45 m (1,000 ft by 150 ft) and was so large that the lifeguards required kayaks for patrol. It was closed in 1971 due to low patronage.

Dimensions

Length

Most pools in the world are measured in metres, but in the United States pools are almost always measured in feet and yards. In the United Kingdom most pools are in metres, but older pools measured in yards still exist. In the US pools tend to either be 25 yards (SCY-short course yards), 25 metres (SCM-short course metres) or 50 metres (long course). US high schools and the NCAA conduct short course (25 yards) competition. There also exist many pools 33⅓ m long, so that 3 lengths = 100 m. This is sometimes jokingly referred to as “inter-course”. This pool dimension is commonly used to accommodate water polo.

USA Swimming (USA-S) swims in both metric and non-metric pools. However, the international standard is metres, and world records are only recognized when swum in 50 m pools (or 25 m for short course). In general, the shorter the pool, the faster the time for the same distance, since the swimmer gains speed from pushing off the wall after each turn at the end of the pool.

Width

Most European pools are between 10 m and 50 m wide.

Depth

The depth of a swimming pool depends on the purpose of the pool, and whether it is open to the public or strictly for private use. If it is a private casual, relaxing pool, it may go from 1.0 m to 2.0 m (3 to 7 feet) deep. If it is a public pool designed for diving, it may slope from 3.0 to 5.0 m (10 to 16 feet) in the deep end. A children’s play pool may be from 30 cm to 1.2 m (1 to 4 feet) deep. Most public pools have differing depths to accommodate different swimmer requirements. In many jurisdictions, it is a requirement to show the water depth with clearly marked depths affixed to the pool walls.

Types

Private pools

A small inflatable “splasher” pool
Private pools are usually smaller than public pools, on average 16′ x 32′ (4.8m x 9.6 m) to 20′ x 40′ (6m x 12 m) whereas public pools usually start at 80 0″ (25.0m). Home pools can be permanently built-in, or be assembled above ground and disassembled after summer. Privately owned outdoor pools in backyards or gardens started to proliferate in the 1950s in regions with warm summer climates, particularly in the United States. In some warm-weather US locations, such as Florida and Arizona, home pools are so common that it is rare to find a new house being built without a pool being considered in the design.

Private pools are increasingly a feature of homes in greater latitudes. For example, in London many larger homes are now refurbished with indoor pools, usually in the basement or in a conservatory. In some European cities, including Munich, it is relatively common for people living in older properties to convert existing internal motorcar garages into indoor pool areas.

Construction methods for private pools vary greatly. The main types of in-ground pools are concrete, vinyl liner, and fiberglass. Above-ground pools (also called “on-ground pools”) are usually cheaper to build. They are especially popular in places where ground freezing makes excavation difficult and threatens damage to the pool structure.

Inexpensive temporary PVC pools can be bought in supermarkets and taken down after summer. They are used mostly outdoors in yards, are typically shallow, and often their sides are inflated with air to stay rigid. When finished, the water and air can be let out and this type of pool can be folded up for convenient storage. They are regarded in the swimming pool industry as “splasher” pools intended for cooling off and amusing toddlers and children, not for swimming.

Some people use hot tubs and spas at home to soak their bodies in water for recreation and therapeutic reasons.

Many toys are available for children and other people to play with in pool water. They are often blown up with air so they are soft but still reasonably rugged, and can float in water.

Many countries now have strict pool fencing laws for private swimming pools, which require pool areas to be isolated so that unauthorized children younger than six years cannot enter. Many countries require a similar level of protection for the children residing in or visiting the house, although many pool owners prefer the visual aspect of the pool in close proximity to their living areas, and will not provide this level of protection. There is no general consensus between states or countries on the requirements to fence private swimming pools, and in many places they are not required at all, particularly in rural settings.

Public pools

Public pools are often found as part of a larger leisure centre or recreational complex. These centres often have more than one pool, such as an indoor heated pool, an outdoor saltwater or unheated chlorinated pool, a shallower children’s pool, and a paddling pool for toddlers and infants. There may also be a sauna and one or more hot tubs or spa pools (“jacuzzis”).

Public pools may belong to a hotel or holiday resort, as an amenity for the recreation of their guests. If a pool is located in a separate building, the building is called a “natatorium”. The building sometimes also has facilities for related activities, such as a diving tank. Outdoor pools are common in warmer climates. Larger pools sometimes have a diving board affixed at one edge above the water. Diving pools should be deep enough that divers are not injured.

Many public swimming pools are rectangles 25 m or 50 m long, but may be any size and shape desired. There are also elaborate pools with artificial waterfalls, fountains, splash pads, wave machines, varying depths of water, bridges, and island bars.

There are often lockers for clothing and other belongings. The lockers often require a coin to be inserted as deposit or payment. There are often showers ready for use – sometimes mandatory – before and/or after swimming.

Wading pools are shallow bodies of water intended for use by small children, usually in parks. Concrete wading pools come in many shapes, traditionally rectangle, square or circle. They are filled and drained daily due to lack of a filter system. Staff chlorinate the water to ensure health and safety standards.

Competition pools

The starting block of a competition swimming pool; they were first used at the 1936 Summer Olympics.
Federation Internationale de la Natation (FINA, International Swimming Federation) sets widely recognized standards for competition pools: 25 m (~82 feet) or 50 m (~164 feet) long and at least 1.35 m (~4.4 feet) deep. Competition pools are generally indoors and heated to enable their use all year round, and to more easily comply with the regulations regarding temperature, lighting, and Automatic Officiating Equipment and equipment.

An Olympic sized swimming pool (first used at the 1924 Olympics) is a pool that meets FINA’s additional standards for the Olympic Games and for world championship events. It must be 50 m (~164 feet) in length by 25 m (~82 feet) wide, divided into eight lanes of 2.5 m (~8.2 feet) each plus two areas of 2.5 m (~8.2 feet) at each side of the pool. The water must be kept at 25–28°C (77-82.4°F) and the lighting level at greater than 1500 lux. Depth must be at least 2 m (~6.5 feet), and there are also regulations for color of lane rope, positioning of backstroke flags (5 meters from each wall), and so on. Pools claimed to be “Olympic pools” do not always meet these regulations, as FINA cannot police use of the term. Touchpads are mounted on both walls for long course meets and each end for short course.

A pool may be referred to as fast or slow, depending on its physical layout. Some design considerations allow the reduction of swimming resistance making the pool faster. Namely, proper pool depth, elimination of currents, increased lane width, energy absorbing racing lane lines and gutters, and the use of other innovative hydraulic, acoustic and illumination designs.

Exercise pools

In the last two decades, a new style of pool has gained popularity. These consist of a small vessel (usually about 2.5 m x 5 m) in which the swimmer swims in place, either against the push of an artificially generated water current or against the pull of restraining devices. These pools have several names, such as swim spas, swimming machines, or swim systems. They are all examples of different modes of resistance swimming.

Hot tubs and spa pools

Hot tubs and spa pools are common heated pools used for relaxation and sometimes for therapy. Commercial spas are common in the swimming pool area or sauna area of a health club or fitness centre, in men’s clubs, women’s clubs, motels and exclusive five star hotel suites. Spa clubs may have very large pools, some segmented into increasing temperatures. In Japan, men’s clubs with many spas of different size and temperature are common. Commercial spas are generally made of concrete, with a mosaic tiled interior. Hot tubs are typically made somewhat like a wine barrel with straight sides, from wood such as Californian redwood held in place by metal hoops. Immersion of the head is not recommended in spas or hot tubs due to a potential risk of underwater entrapment from the pump suction forces. However commercial installations in many countries must comply with various safety standards which reduce this risk considerably.

Home spas are a world-wide retail item in western countries since the 1980s, and are sold in dedicated spa stores, pool shops, department stores, the Internet, and catalog sales books. They are almost always made from heat-extruded acrylic sheet Perspex, often colored in marble look-alike patterns. They rarely exceed 8 ft² (2,400mm²) and are typically 3 ft 6 in (1 m) deep, restricted by the availability of the raw sheet sizes (typically manufactured in Japan). There is often a mid-depth seating or lounging system, and contoured lounger style reclining seats are common. Upmarket spas include various jet nozzles (massage, pulsating etc.), a drinks tray, lights, LCD flat-screen TV sets and other features that make the pool a recreation center. Due to their family-oriented nature, home spas are normally operated from 36°C to 39°C (97-102°F). Many pools are incorporated in a redwood or simulated wood surround, and are termed “portable” as they may be placed on a patio rather than sunken into a permanent location. Some portable spas are shallow and narrow enough to fit sideways through a standard door and be used inside a room. Low power electric immersion heaters are common with home spas.

Whirlpool tubs first became popular in America during the 1960s and 70’s. A spa is also called a “jacuzzi” in USA since the word became a generic after plumbing component manufacturer Jacuzzi introduced the “Spa Whirlpool” in 1968. Air bubbles may be introduced into the nozzles via an air-bleed venturi pump that combines cooler air with the incoming heated water to cool the pool if the temperature rises uncomfortably high. Some spas have a constant stream of bubbles fed via the seating area of the pool, or a footwell area. This is more common as a temperature control device where the heated water comes from a natural (uncontrolled heat) geothermal source, rather than artificially heated. Water temperature is usually very warm to hot — 38°C to 42°C (100 to 108 °F), so bathers usually stay in for only 20 to 30 minutes. Bromine or mineral sanitizers are often recommended as sanitizers for spas because chlorine dissipates at a high temperature thereby heightening its strong chemical smell. Ozone is an effective bactericide and is commonly included in the circulation system with cartridge filtration, but not with sand media filtration due to clogging problems with turbid body fats.

Ocean pools

In the early 20th century, especially in Australia, ocean pools, called lidos, were built typically on headlands by enclosing part of the rock shelf, with water circulated through the pools by flooding from tidal tanks or by regular flooding over the side of the pools at high tide. There were often separate pools for women and men, or the pool was open to the sexes at different times with a break for bathers to come without fear of observation by the other sex. Segregated changing sheds and showers were provided. These were the fore-runners of modern ‘Olympic’ pools. A variation was the later development of sea- or harbour-side pools that circulated sea water using pumps. A pool of this type was the training ground for Australian Olympian Dawn Fraser.

Infinity pools

An infinity pool (also named negative edge or vanishing edge pool) is a swimming pool which produces a visual effect of water extending to the horizon, vanishing, or extending to “infinity”. Often, the water appears to fall into an ocean, lake, bay, or other similar body of water. The effect is best captured in a pool where the liner color matches the body of water it is “falling” into.

Other uses

Swimming pools are also used for events such as synchronized swimming, water polo and canoe polo as well as for teaching diving and lifesaving techniques. They have also been used for specialist tasks such as teaching water-ditching survival techniques for helicopter and submarine crews and astronaut training. Round-cornered, irregular swimming pools, drained of water, were the first surfaces used for vertical skateboarding.

Sanitation

Swimming pool water must be maintained at low levels of bacteria and viruses to prevent the spread of diseases and pathogens between users. Bacteria, algae and insect larvae can also enter the pool without help from swimmers, and cause disease to swimmers and other people in the area.

Pumps and mechanical filters are often used to filter such pathogens out of the water. Chemical disinfectants, such as hypochlorous acid, sodium hypochlorite (household bleach), bromine, salt or mineral sanitizers, are used to make the water inhospitable to pathogens. These substances also turn the water into a faded blue/green color.

The subprime mortgage crisis in the United States caused many people to leave their homes without emptying their swimming pools. This resulted in the pools turning green with algae and becoming mosquito breeding grounds in less than a week.

Winterization

In areas which reach freezing temperature, it is important to close a pool properly. This varies greatly between inground and aboveground pools. By taking steps to properly secure the pool, it lessens the likelihood that the superstructure will be damaged or compromised by freezing water.

Closing vinyl and fibreglass pools

In preparation for freezing temperatures, an in-ground swimming pool’s pipes must be emptied. An above-ground pool should also be closed, so that ice does not drag down the pool wall, collapsing its structure. The plumbing is sealed with air, typically with rubber plugs, to prevent cracking from freezing water. The pool is typically covered to prevent leaves and other debris from falling in. The cover is attached to the pool typically using a stretch cord, similar to a bungee cord and hooks fitted into the pool surround. The skimmer is closed off or a floating device is placed into it to prevent it from completely freezing and cracking. Floating objects such as life rings or basketballs can be placed in the pool to avoid its freezing under the cover. Drain plugs on the pool filter are removed after the filter has been cleaned. The pool pump motor is taken under cover. Winter chemicals are added to keep the pool clean.

In climates where there is no risk of freezing, closing down the pool for winter is not so important. Typically, the thermal cover is removed and stored. Winter sunlight can create an algae mess when a cover that has been left on all winter is removed. The pool is correctly pH-balanced and super-chlorinated. One litre algaecide for every 50,000 litres of pool water should be added, and topped up each month. The pool should be filtered for one to two hours daily to keep the automated chlorination system active.

Covers
Swimming pool heating costs can be significantly reduced by using a pool cover. Use of a pool cover also can help reduce the amount of chemicals (chlorine, etc) required by the pool. Outdoor pools gain heat from the sun, absorbing 75%–85% of the solar energy striking the pool surface. Though a cover decreases the total amount of solar heat absorbed by the pool, the cover eliminates heat loss due to evaporation and reduces heat loss at night through its insulating properties.

The heating effectiveness of a cover depends on type. A transparent bubble cover is the most effective, as it allows the largest amount of solar flux into the pool itself. A darker cover absorbs more sunlight directly, allowing temperature to rise faster, but ultimately prevents the pool from reaching as high a temperature as a clear cover.

Pool cover automation

A pool cover can be either manually, semi-automatically, or automatically operated. Manual covers can be folded and stored in a convenient location. Pool cover reels can also be used to help manually roll up the pool cover. The reel, usually on wheels, can be rolled out of the way.

Semi-automatic covers use a motor-driven reel system. They use electrical power to roll and unroll the cover, but usually require someone to pull on the cover when unrolling, or guide the cover onto the reel when rolling up the cover. Semi-automatic covers can be built into the pool deck surrounding the pool, or can use reels on carts.

Automatic covers have permanently mounted reels that automatically cover and uncover the pool at the push of a button. They are the most expensive option, but are also the most convenient.

Some pool covers fit into tracks along the sides of the pool. This prevents anything or anybody from getting into the pool. They even support the weight of several people. They can be run manually, semi-automatically, or automatically. Safety covers may be required by inspectors for public pools.

Pool cover materials

There are three main materials used for pool covers: Vinyl, thermal bubble and debris.

Vinyl covers

Vinyl covers consist of a heavier material and have a longer life expectancy than bubble covers. Insulated vinyl covers are also available with a thin layer of flexible insulation sandwiched between two layers of vinyl.

Thermal bubble covers

Thermal bubble covers are lightweight UV stabilized floating covers designed to minimize heat loss on heated swimming pools. Typically they are only fitted in spring and fall (autumn) when the temperature difference between pool water and air temperature is greatest. They raise temperature of a pool by around 20 °Fahrenheit, or 11 °Celsius, after being on the pool for a week. Most swimming pool heat loss is through evaporation.

Bubble covers are typically applied and removed by being rolled up on a device fitted to one side of the pool (see illustration). Covers fall apart after 4 or 5 years due to sun exposure, overheating in the sun while off the pool, and chlorine attacking the plastic.

Bubble covers should be removed during super chlorination.
These covers are mandatory to be fitted to all pools in areas of Australia that have experienced drought since 2006. This is an effort to conserve water, as much water evaporates and transpires.

Debris covers
These covers are typically attached all winter, by hooked bungee cords or hooked springs connected to the pool deck, and are usually made of black or green fine PVC mesh. They are designed to stop leaf debris from entering the pool. They also provide some safety for animals and small children, but should not be relied on. They are not popular in warmer climates, due to the five to ten minutes it takes to fit/remove, making them inconvenient for repeated application and removal.

Safety

Pools present a significant risk of infant and toddler death due to drowning. In regions where residential pools are common, drowning is a major cause of childhood fatalities. Therefore it is advisable to closely watch small children around swimming pools, especially private pools that do not have professional lifeguards. Adults are more likely to be aware of risks, but it is still a good idea to have more than one person around when using a private pool. As a precaution, many municipalities have by-laws that require that residential pools be enclosed with fencing to restrict unauthorized access.

In public pools there is a lower risk of accident, with trained lifeguards on duty whenever the pool is open. Because of the risk of drowning and the desire for greater safety, and technological advances that make such safety possible, more and more public pools are equipped with computer-aided drowning prevention or other forms of electronic and sometimes automated safety and security systems. Among these are the Poseidon system, Swimguard, and the Drowning Early Warning System (DEWS).

The best way to ensure safety around pools is to be educated. Knowing how a swimming pool works greatly improves safety. Long haired individuals must avoid water inlets. These inlets, also known as skimmers, are rectangular holes on the wall that are sometimes partly or completely underwater. In private pools there can be one to two inlets, in public pools five to twenty. Also to be avoided are the main drains, usually identified as round mesh covered objects on the pool floor, as poor design can occasionally cause a safety problem. Building codes and product standards have eliminated these hazards for current designs, but not all pools are up to standard.

Also the bigger the body of water, the greater force it needs to have the water circulating. Stronger water pumps are used on large pools to keep them healthy, so extra care must be taken when swimming along the sides or floor of the pool.

People with recent piercings are advised to keep those from being submerged in pools, to avoid them being infected.

Suspended ceilings in indoor swimming pools are safety-relevant components. As was demonstrated by the collapses of the ceiling of the Uster (Switzerland) indoor swimming pool (1985) and again at Steenwijk (Netherlands, 2001), attention must be paid to selecting suitable materials and inspecting the state of such components. The reason for the failures was stress corrosion cracking of metal fastening components made of stainless steel.

There is also the problem with chemical exposure from chlorinated swimming pools. Numerous scientific studies have shown increased instances of Asthma of those who swim regularly or those who work in and around indoor swimming pools. Another study with children found that kids who swam in indoor swimming pools for 1.8 hours or more a week had lung conditions similar to those of a heavy smoker. Also chlorine exposure from swimming pools has been shown to increase the risk of bladder and kidney cancer by more than 56% and it was also noted in the 2000 Olympics in Sydney Australia, where 25% of the U.S Olympic swim team suffered from some level of Asthma.

Dress code

In public swimming pools dress code may be stricter than on public beaches, and in indoor pools stricter than outdoor pools. For example, in countries where women can be topless on the beach, this is often not allowed in a swimming pool, especially one indoors.

Dress codes are also stricter in pools than on beaches: wearing shoes, and a shirt, on a beach is acceptable, but often not in a pool. Indoor pools have stricter dress codes than outdoor pools: in outdoor pools, men are often allowed to wear t-shirts for modesty or for protection from sunburn, but in indoor pools they must usually go shirtless. At beaches, many people swim with clothes on and wear beachwear, but at pools (especially indoor pools) more minimal attire is often worn, such as lycra briefs for men or lycra one-piece tanksuits for women. Swimming with clothes on (for example, as practice for the prevention of drowning, as one might fall off a boat clothed) often results in objections from lifeguards at pools, especially indoor pools. In France, board shorts are usually not allowed for hygiene reasons. In Scandinavian countries and in particular Iceland, rules about clothing and hygiene are especially strict. More recently, dress codes in many pools were relaxed to allow more modesty. Many pool operators allow people to swim fully clothed in clothes they only use in the pool if they shower in these clothes before entering the pool.

For diving from towers perhaps 10 m high, sometimes bathing suits are doubled up (i.e., men will often wear one brief inside another) so that the swimsuit does not rip on impact with the water. While splashing around on beaches, especially on urban beaches, looser fitting bathing attire that is more modest is often worn.

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Thalassotherapy (from the Greek word thalassa, meaning “sea”) is the medical use of seawater. The properties of seawater are believed to have beneficial effects upon the pores of the skin. Thalassotherapy was developed in seaside towns in Brittany, France during the 19th century. Trace elements of magnesium, potassium, calcium, sodium, and iodide found in seawater are believed to be absorbed through the skin. The effectiveness of this method of therapy is not widely accepted as it has not been proven scientifically. The therapy is applied in various forms, as either showers of warmed seawater, application of marine mud or of algae paste, or the inhalation of sea fog. Spas make hot seawater and provide mud and seaweed wrapping services. This type of therapy is common in the Dead Sea area.

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Tourism is travel for recreational or leisure purposes. The World Tourism Organization defines tourists as people who “travel to and stay in places outside their usual environment for not more than one consecutive year for leisure, business and other purposes not related to the exercise of an activity remunerated from within the place visited”. Tourism has become a popular global leisure activity. In 2007, there were over 903 million international tourist arrivals, with a growth of 6.6% as compared to 2006. International tourist receipts were USD 856 billion in 2007.

Despite the uncertainties in the global economy, international tourist arrivals during the first four months of 2008 followed a similar growth trend than the same period in 2007. However, as a result of the economic crisis of 2008, international travel demand suffered a strong slowdown beginning in June 2008, with growth in international tourism arrivals worldwide falling to 2% during the boreal summer months, while growth from January to April 2008 had reached an average 5.7% compared to its 2007 level. Growth from 2007 to 2008 was only 3.7%, as total international tourism arrivals from January to August were 641 million tourists, up from 618 million in the same period in 2007.

Tourism is vital for many countries such as U.A.E, Egypt, Greece, Thailand and many island nations such as The Bahamas, Fiji, Maldives, Seychelles due to the large intake of money for businesses with their goods and services and the opportunity for employment in the service industries associated with tourism. These service industries include transportation services such as cruise ships and taxis, accommodation such as hotels and entertainment venues, and other hospitality industry services such as resorts.

Definition

Hunziker and Krapf, in 1941, defined tourism as “the sum of the phenomena and relationships arising from the travel and stay of non-residents, insofar as they do not lead to permanent residence and are not connected with any earning activity.” In 1976, the Tourism Society of England defined it as “Tourism is the temporary, short-term movement of people to destination outside the places where they normally live and work and their activities during the stay at each destination. It includes movements for all purposes.” In 1981, International Association of Scientific Experts in Tourism defined Tourism in terms of particular activities selected by choice and undertaken outside the home environment.

The United Nations classified three forms of tourism in 1994 in its Recommendations on Tourism Statistics: Domestic tourism, which involves residents of the given country traveling only within this country; Inbound tourism, involving non-residents traveling in the given country; and Outbound tourism, involving residents traveling in another country.
The UN also derived different categories of tourism by combining the 3 basic forms of tourism: Internal tourism, which comprises domestic tourism and inbound tourism; National tourism, which comprises domestic tourism and outbound tourism; and International tourism, which consists of inbound tourism and outbound tourism. Intrabound tourism is a term coined by the Korea Tourism Organization and widely accepted in Korea. Intrabound tourism differs from domestic tourism in that the former encompasses policymaking and implementation of national tourism policies.
Recently, the tourism industry has shifted from the promotion of inbound tourism to the promotion of intrabound tourism because many countries are experiencing tough competition for inbound tourists. Some national policymakers have shifted their priority to the promotion of intrabound tourism to contribute to the local economy. Examples of such campaigns include “See America” in the United States, “Truly Asia” in Malaysia, “Get Going Canada” in Canada, “Wow Philippines” in the Philippines, “Uniquely Singapore” in Singapore, “100% Pure New Zealand” in New Zealand, “Amazing Thailand” in Thailand, “The Hidden Charm” in Vietnam and “Incredible India” in India.

History

Wealthy people have always traveled to distant parts of the world to see great buildings and works of art, to learn new languages, to experience new cultures, and to taste different cuisines. As long ago as the time of the Roman Republic, places such as Baiae were popular coastal resorts for the rich. The word tourism was used by 1811 and tourist by 1840. In 1936 the League of Nations defined foreign tourist as someone travelling abroad for at least twenty-four hours. Its successor, the United Nations amended this definition in 1945 by including a maximum stay of six months.

Pre twentieth century

European tourism can be said to originate with the medieval pilgrimage. Although undertaken primarily for religious reasons, the pilgrims in the Canterbury Tales saw the experience as a holiday (the term itself being derived from the ‘holy day’ and its associated leisure activities). Pilgrimages created a variety of tourist aspects that still exist – bringing back souvenirs, obtaining credit with foreign banks (in medieval times utilizing international networks established by the Lombards), and making use of space available on existing forms of transport (such as the use of medieval English wine ships bound for Vigo by pilgrims to Santiago de Compostela). Religious and secular pilgrimages are still prevalent in modern tourism – such as to Lourdes or Knock in Ireland, Graceland and the grave of Jim Morrison in Père Lachaise Cemetery.

During the 17th century, it became fashionable in England to undertake a Grand Tour. The sons of the nobility and gentry were sent upon an extended tour of Europe as an educational experience. The 18th century was the golden age of the Grand Tour, and many of the fashionable visitors were painted at Rome by Pompeo Batoni.

Health tourism has long existed, but it was not until the eighteenth century that it became important. In England, it was associated with spas, places with supposedly health-giving mineral waters, treating diseases from gout to liver disorders and bronchitis. The most popular resorts were Bath, Cheltenham, Buxton, Harrogate, and Tunbridge Wells. Visits to take ‘the waters’ also allowed the visitors to attend balls and other entertainments. Continental Spas such as Carlsbad (Karlovy Vary) attracted many fashionable travellers by the nineteenth century.

Leisure travel

Leisure travel was associated with the industrialisation of United Kingdom – the first European country to promote leisure time to the increasing industrial population. Initially, this applied to the owners of the machinery of production, the economic oligarchy, the factory owners, and the traders. These comprised the new middle class. Cox & Kings were the first official travel company to be formed in 1758. Later, the working class could take advantage of leisure time.

The British origin of this new industry is reflected in many place names. At Nice, France, one of the first and best-established holiday resorts on the French Riviera, the long esplanade along the seafront is known to this day as the Promenade des Anglais; in many other historic resorts in continental Europe, old well-established palace hotels have names like the Hotel Bristol, the Hotel Carlton or the Hotel Majestic – reflecting the dominance of English customers.
Many tourists do leisure tourism in the tropics both in the summer and winter. It is often done in places such as Cuba, Dominican Republic, Thailand, North Queensland in Australia and Florida in the United States.

Winter tourism

Major ski resorts are located in various mainland European countries, Canada, the United States, Australia, New Zealand, Japan, Korea, Chile and Argentina.

Mass tourism

Mass travel could only develop with improvements in technology allowed the transport of large numbers of people in a short space of time to places of leisure interest, and greater numbers of people began to enjoy the benefits of leisure time.

In the United States, the first great seaside resort, in the European style, was Atlantic City, New Jersey, and Long Island.

In Continental Europe, early resorts included Ostend (for the people of Brussels), and Boulogne-sur-Mer (Pas-de-Calais) and Deauville (Calvados) (for Parisians), and Heiligendamm (founded 1797 as the first seaside resort at the Baltic Sea).

Adjectival tourisms

Adjectival tourism refers to the numerous niche or specialty travel forms of tourism that have emerged over the years, each with its own adjective. Many of these have come into common use by the tourism industry and academics. Others are emerging concepts that may or may gain popular useage. Examples of the more common niche tourism markets include:

– Aboriginal tourism (also Tribal tourism and Native American tourism)
– Adventure tourism (or Adventure travel usually outdoors)
– Alternative tourism
– Backpack tourism (or Youth Backpack tourism,)
– Battlefield tourism
– Border tourism (or Cross-Border Tourism)
– Convention (meeting)
– Celebrity tourism (including Celebrity Cruises)
– Community Based tourism (or Community Supported tourism)
– Cruise tourism
– Culinary tourism
– Disaster tourism
– Dark tourism
– Dive tourism
– Ecotourism (or Eco-tourism in some countries)
– Educational tourism (or Edutourism)
– Ethnic tourism
– Event tourism (or Special Event tourism, including Festivals)
– Extreme tourism (or Shock tourism)
– FIT – Free Independent Traveler (or Fully Independent Travel)
– Geopark Tourism (geology-based)
– Geotourism (related to Sustainable tourism)
– Girlfriend Getaway (all female trip)
– GIT – Group Inclusive Travel
– Golf tourism
– Greif tourism (related to Dark tourism)
– Health tourism (or Wellness Tourism; overlap with Medical tourism and New Age Tourism)
– Heritage tourism
– Incentive travel (gift vacations for employees)
– Island tourism
– Honeymoon (or Second Honeymoon)
– LGBT tourism
– Mass tourism
– Medical tourism
– MICE – Meetings, Incentive Travel, Conventions and Exhibitions (or Meetings, Incentives, Conferencing, Exhibitions)
– Mountain tourism
– Nautical tourism
– New Age tourism
– Nightlife tourism (also Entertainment tourism)
– Package tourism
– Photography (or Photo) tourism
– Religious tourism (including Pilgrimage)
– Reunion tourism
– Roots tourism (or Genealogy related tourism)
– Rural tourism
– Second Home tourism
– Sex tourism
– Shopping tourism
– Space tourism
– Sports tourism
– SSS – Sun, Sand and Surf
– Sustainable tourism
– Thanatourism (meaning death related tourism)
– Urban tourism
– VFR – Visiting Friends and Relatives
– Volunteer tourism (or Volunteer travel)
– War tourism
– Winter (Sports) tourism

Recent developments

There has been an upmarket trend in the tourism over the last few decades, especially in Europe where international travel for short breaks is common. Tourists have higher levels of disposable income and greater leisure time and they are also better-educated and have more sophisticated tastes. There is now a demand for a better quality products, which has resulted in a fragmenting of the mass market for beach vacations; people want more specialised versions, such as Club 18-30, quieter resorts, family-oriented holidays, or niche market-targeted destination hotels.

The developments in technology and transport infrastructure, such as jumbo jets and low-cost airlines, and more accessible airports have made many types of tourism more affordable. There have also been changes in lifestyle, such as retiree-age people who sustain year round tourism. This is facilitated by internet sales of tourism products. Some sites have now started to offer dynamic packaging, in which an inclusive price is quoted for a tailor-made package requested by the customer upon impulse.

There have been a few setbacks in tourism, such as the September 11 attacks and terrorist threats to tourist destinations such as Bali and European cities. Some of the tourist destinations, including the beach resorts of Cancún have lost popularity due to shifting tastes. In this context, the excessive building and environmental destruction often associated with traditional “sun and beach” tourism may contribute to a destination’s saturation and subsequent decline. Spain’s Costa Brava, a popular 1960s and 1970s beach location is now facing a crisis in its tourism industry.

On December 26, 2004 a tsunami, caused by the 2004 Indian Ocean earthquake hit Asian countries bordering the Indian Ocean, and also the Maldives. Thousands of lives were lost, and many tourists died. This, together with the vast clean-up operation in place, has stopped or severely hampered tourism to the area.

The terms tourism and travel are sometimes used interchangeably. In this context travel has a similar definition to tourism, but implies a more purposeful journey. The terms tourism and tourist are sometimes used pejoratively, to imply a shallow interest in the cultures or locations visited by tourists.

Ecotourism

Ecotourism (also known as ecological tourism) is a form of tourism, that appeals to ecologically and socially conscious individuals. Generally speaking, ecotourism focuses on volunteering, personal growth and learning new ways to live on the planet. It typically involves travel to destinations where flora, fauna and cultural heritage are the primary attractions. Ecotourism is a conceptual experience, enriching those who delve into researching and understanding the environment around them. It gives us insight into our impacts, as human beings and also a greater appreciation of our own natural habitats.

Responsible ecotourism includes programs that minimize the negative aspects of conventional tourism on the environment and enhance the cultural integrity of local people. Therefore, in addition to evaluating environmental and cultural factors, an integral part of ecotourism is the promotion of recycling, energy efficiency, water conservation and creation of economic opportunities for the local communities.

Medical tourism

When there is a significant price difference between countries for a given medical procedure particularly in Southeast Asia, India and Eastern Europe or where there are different regulatory regimes between countries in relation to particular medical procedures (eg dentistry) travelling to take advantage of the price or regulatory differences is often referred to as “medical tourism”.

Educational tourism
Educational tourism developed because of the growing popularity of teaching and learning of knowledge, and enhancing technical competency outside the classroom environment. In the educational tourism, the main focus of the tour or leisure activity includes visitation of another country to learn about the culture of the visited country (Student Exchange Program and Study Tour) or to work and apply their learning inside the classroom in different environment (International Practicum Training Program).

Other developments

– Emerging Adjectival Tourism Terms
– Atrocity tourism (also War, Disaster, etc., above)
– Hot-Spot tourism (places of current armed conflict)
– Staycation (very popular term in summer 2008)
– Babymoon (a pre-birth honeymoon)
– Celebration Vacations (travel to celebrate a special event)
– Creative tourism (tourist participation in destination arts) (see below)
– Graffiti tourism (travel to commit graffiti)
– Libel tourism
– Mancation (an all male trip)
– Momcation (for mothers)
– Purposeful tourism (also Meaningful Tourism, related to Volunteer travel, also known as Voluntourism)
– Tummy Tuck Travel (Medical tourism for plastic surgery)

Creative tourism

Creative tourism has existed as a form of cultural tourism since the early beginnings of tourism itself. Its European roots date back to the time of the Grand Tour, which saw the sons of aristocratic families traveling for the purpose of (mostly interactive) educational experiences. More recently, creative tourism has been given its own name by Crispin Raymond and Greg Richards, who as a member of the Association for Tourism and Leisure Education (ATLAS) has directed a number of projects for the European Commission, including cultural tourism, crafts tourism or sustainable tourism. They have defined “creative tourism” as tourism related to the active participation of travelers in the culture of the host community, through interactive workshops and informal learning experiences.

Meanwhile, the concept of creative tourism has been picked up by high-profile organizations such as UNESCO, who through the Creative Cities Network have endorsed creative tourism as an engaged, authentic experience that promotes an active understanding of the specific cultural features of a place.

More recently, creative tourism has gained popularity as a form of cultural tourism, drawing on active participation by travelers in the culture of the host communities they visit. Several countries offer examples of this type of tourism development, including the United Kingdom, Spain, Italy and New Zealand.

Dark tourism

One emerging area of special interest tourism has been identified by Lennon and Foley (2000) as “dark” tourism. This type of tourism involves visits to “dark” sites such as battlegrounds, scenes of horrific crimes or acts of genocide, for example concentration camps. Dark tourism poses severe ethical and moral dilemmas: should these sites be available for visitation and, if so, what should the nature of the publicity involved be. Dark tourism remains a small niche market driven by varied motivations, such as mourning, remembrance, macabre curiosity or even entertainment. Its early origins are rooted in fairgrounds and medieval fairs.

Growth

The World Tourism Organization (UNWTO) forecasts that international tourism will continue growing at the average annual rate of 4 %. By 2020 Europe will remain the most popular destination, but its share will drop from 60% in 1995 to 46%. Long-haul will grow slightly faster than intraregional travel and by 2020 its share will increase from 18% in 1995 to 24%.

With the advent of e-commerce, tourism products have become one of the most traded items on the internet. Tourism products and services have been made available through intermediaries, although tourism providers (hotels, airlines, etc.) can sell their services directly. This has put pressure on intermediaries from both on-line and traditional shops.

It has been suggested there is a strong correlation between Tourism expenditure per capita and the degree to which countries play in the global context. Not only as a result of the important economic contribution of the tourism industry, but also as an indicator of the degree of confidence with which global citizens leverage the resources of the globe for the benefit of their local economies. This is why any projections of growth in tourism may serve as an indication of the relative influence that each country will exercise in the future.

Space tourism is expected to “take off” in the first quarter of the 21st century, although compared with traditional destinations the number of tourists in orbit will remain low until technologies such as a space elevator make space travel cheap.

Technological improvement is likely to make possible air-ship hotels, based either on solar-powered airplanes or large dirigibles. Underwater hotels, such as Hydropolis, expected to open in Dubai in 2009, will be built. On the ocean, tourists will be welcomed by ever larger cruise ships and perhaps floating cities.

Latest trends

As a result of the economic crisis of 2008, international arrivals suffered a strong slowdown beginning in June 2008. Growth from 2007 to 2008 was only 3.7% during the first eight months of 2008. The Asian and Pacific markets were affected and Europe stagnated during the boreal summer months, while the Americas performed better, reducing their expansion rate but keeping a 6% growth from January to August 2008. Only the Middle East continued its rapid growth during the same period, reaching a 17% growth as compared to the same period in 2007. This slowdown on international tourism demand was also reflected in the air transport industry, with a negative growth in September 2008 and a 3.3% growth in passenger traffic through September. The hotel industry also reports a slowdown, as room occupancy continues to decline. As the global economic situation deteriorated dramatically during September and October as a result of the global financial crisis, growth of international tourism is expected to slow even further for the remaining of 2008, and this slowdown in demand growth is forecasted to continue into 2009 as recession has already hit most of the top spender countries, with long-haul travel expected to be the most affected by the economic crisis.

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A turnkey or a turnkey project is a type of project that is constructed by a developer and sold or turned over to a buyer in a ready to use condition.

Common usage

Turnkey refers to something that is ready for immediate use, generally used in the sale or supply of goods or services. The term is common in the construction industry, for instance, in which it refers to the bundling of materials and labor by sub-contractors. A “turnkey” job by a plumber would include the parts (toilets, tub, faucets, pipes, etc.) as well as the plumber’s labor, without any contribution by the general contractors.

This is commonly used in motorsports to describe a car being sold with drivetrain (engine, transmission, etc.) as a racer may prefer to keep the pieces to use in another vehicle to preserve a combination. Similarly, this term may be used to advertise the sale of an established business, including all the equipment necessary to run it, or by a business-to-business supplier providing complete packages for business start-up.

Use in business

In a turnkey business transaction different entities are responsible for setting up a plant or equipment (e.g. trains/infrastructure) and for putting it into operation. It can include contractual actions – at least through the system, subsystem, or equipment installation phase. It may also include follow-on contractual actions, such as testing, training, logistical, and operational support. It is often given to the best bidder in a procurement process.

Turnkey projects can also be extended, known as turnkey plus, where there is perhaps a small equity interest by the supplier and it will later on continue its operation through a management contract or licensing.

Specific usage

The term turnkey is also often used in the technology industry, most commonly to describe pre-built computer “packages” in which everything needed to perform a certain type of task (e.g. audio editing) is put together by the supplier and sold as a bundle. This often includes a computer with pre-installed software, various types of hardware, and accessories. Such packages are commonly called appliances.

In the United States, the precise definition of the types of allowable contractual features for government contracts are contained in the Federal Acquisition Regulations.

In real estate, turn-key is defined as delivering a location that is ready for occupation. The turn-key process includes all of the steps involved to open a location including the site selection, negotiations, space planning, construction coordination and complete installation.

Historically, the term once referred to jailers, as the holders of a prison’s keys, as in Charles Dickens’ 1840 novel, Barnaby Rudge.

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A waterfall is usually a geological formation resulting from water, often in the form of a stream, flowing over an erosion-resistant rock formation that forms a nickpoint, or sudden break in elevation.
Some waterfalls form in mountain environments in which the erosive water force is high and stream courses may be subject to sudden and catastrophic change. In such cases, the waterfall may not be the end product of many years of water action over a region, but rather the result of relatively sudden geological processes such as landslides, faults or volcanic action. In cold places, snow will build up in winter and melt and turn into a waterfall in summer. Water falls can be cool.

Formation

Formation of a waterfall

Typically, a river flows only once a month over a large step in the rocks that may have been formed by a fault line. As it increases its velocity at the edge of the waterfall, it plucks material from the riverbed. This causes the waterfall to carve deeper into the bed and to recede upstream. Often over time, the waterfall will recede back to form a canyon or gorge downstream as it recedes upstream, and it will carve deeper into the ridge above it.

Often, the rock stratum just below the more resistant shelf will be of a softer type, meaning that undercutting due to splashback will occur here to form a shallow cave-like formation known as a rock shelter or plunge pool under and behind the waterfall. Eventually, the outcropping, more resistant cap rock will collapse under pressure to add blocks of rock to the base of the waterfall. These blocks of rock are then broken down into smaller boulders by attrition as they collide with each other, and they also erode the base of the waterfall by abrasion, creating a deep plunge pool or gorge.

Streams become wider and shallower just above waterfalls due to flowing over the rock shelf, and there is usually a deep pool just below the waterfall because of the kinetic energy of the water hitting the bottom. Waterfalls normally form in a rocky area due to erosion.

Waterfalls can occur along the edge of glacial trough, whereby a stream or river flowing into a glacier continues to flow into a valley after the glacier has receded or melted. The large waterfalls in Yosemite Valley are examples of this phenomenon. The rivers are flowing from hanging valleys.

Classifying Waterfalls

Waterfalls are grouped into ten broad classes based on the average volume of water present on the fall using a logarithmic scale. Class 10 waterfalls include Niagara Falls, Paulo Alfonso Falls and Khone Falls.

Classes of other well-known waterfalls include Victoria Falls and Kaieteur Falls (Class 9); Rhine Falls, Gullfoss and Sutherland Falls (Class 8); Angel Falls and Dettifoss (Class 7); Yosemite Falls and Lower Yellowstone Falls and Umphang Thee Lor Sue Water Fall Thailand (Class 6).

Types of waterfalls

– Dark Hollow Falls, near Skyline Drive, Virginia, is an example of a cascade waterfall
– Block: Water descends from a relatively wide stream or river.
– Cascade: Water descends a series of rock steps.
– Cataract: A large, powerful waterfall.
– Fan: Water spreads horizontally as it descends while remaining in contact with bedrock.
– Horsetail: Descending water maintains some contact with bedrock.
– Plunge: Water descends vertically, losing contact with the bedrock surface.
– Punchbowl: Water descends in a constricted form and then spreads out in a wider pool.
– Segmented: Distinctly separate flows of water form as it descends.
– Tiered: Water drops in a series of distinct steps or falls.
– Multi-step: A series of waterfalls one after another of roughly the same size each with its own sunken plunge pool.

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A waterpark is an amusement park that features waterplay areas, such as water slides, splash pads, spraygrounds (water playgrounds), lazy rivers, or other recreational bathing, swimming, and barefooting environments. Waterparks in more current states of development may also be equipped with some type of artificial surfing or bodyboarding environment such as a wave pool or a FlowRider.

Evolution of waterparks

Waterparks have grown in popularity since their introduction in the late 1940s. The United States has the largest and most concentrated waterpark market, with over a thousand waterparks and dozens of new parks opening each year. Major organizations are IAAPA (International Association of Amusement Parks and Attractions) and WWA (World Waterpark Association).

Waterparks emerging from spas continue to more closely resemble mountain resorts as they become four-season destinations, e.g. Splash Universe Water Park Resort, a member of the World Water Park Association, is themed to match the community in which they are a located to enhance the communities’ destination appeal. Therefore the whole amusement and leisure time industry is getting even more concentrated as the winter sports are mixing up with the summertime water rides – in time and space. A process of concentration can be observed in the hybrid segments of theme-, amusement-, and waterparks. Some waterparks are more spa-oriented, e.g. Schwaben Quellen, a member of European Waterparks Association (EWA) has no water slides, but instead has lots of saunas, steam rooms, “adventure showers”, and relaxation-oriented waterplay areas.

Indoor waterparks
The first ever indoor waterpark was built in Edmonton, Alberta, Canada in 1985 at the West Edmonton Mall as part of the $1.2 billion dollar Phase III expansion. Called World Waterpark, it is over 225,000 sq feet (20,000m sq) in size. It includes the world’s largest indoor wave pool, waterslides of varying degrees, tube rides, zip lines, bungee jumping, and hot tubs.

With 5 indoor waterparks, Wisconsin Dells, Wisconsin, is recognized as the “Waterpark Capital of the World.” It showcases America’s largest indoor and outdoor waterparks (see Noah’s Ark Waterpark). Indoor waterparks in Wisconsin Dells debuted in 1991 after the Chinese Hotel built the first one that year, but have since caught on quickly in many areas. Usually resort hotels featuring massive indoor waterparks that are often reserved exclusively for overnight guests, companies like Great Wolf Resorts/Great Wolf Lodge and Kalahari Resorts have branched out from their origin in the Dells to open new locations around the country. The largest indoor waterpark in the United States is the Honolulu Resort in Hawaii which opened in December 1982. In May 2008 the Honolulu Resort will open an addition to their waterpark making it a total of 2,000 square feet (190 m2).

The premier UK indoor waterpark is the Sandcastle Waterworld at Blackpool, England which has the Master Blaster, the world’s longest indoor roller coaster-style ride.

There are many waterparks in Southern Europe where the climate suits a long season. For example in Portugal on the Algarve there are three main parks – Aqualand, Aquashow and Slide and Splash.

Waterpark-like spaces
Spaces that are similar to waterparks include urban beaches, and splash pads, and smaller waterplay areas such as waterslides in many hotels and public pools. For example, the Delta Chelsea hotel in Toronto features a four story waterslide called the “corkscrew”.

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A water slide is a type of slide or tube designed for warm-weather or indoor recreational use, typically with water pumped to its top and allowed to flow down its surface, although some may simply be wet. A person is able to sit directly on the slide, or on a raft or tube designed to be used with the slide, and slide to the bottom via gravity. The water reduces friction so sliders travel down the slide very quickly. Water slides typically run into a swimming pool (often called a plunge pool) at the end. Some, however, have long, flat, straight sections at the bottom with a few inches of standing water, frictional material, or rollers attached to the slide designed to slow the slider and allow them to safely exit the slide.

Water slides are popular at water parks, such as the Wet ‘n Wild parks located throughout the United States or Sandcastle Waterworld at Blackpool in the United Kingdom and are great alternatives to those who don’t like such intense rides at other amusement parks. If these empty into a pool, the pool is usually designed only to catch sliders who must exit the pool immediately after coming to a stop, to prevent sliders entering the pool at high speed from striking other swimmers. These Plunge pools are usually quickly cleared by other swimmers to avoid injury. Smaller water slides may be found at actual swimming pools in water parks, private locations and community recreation centers where larger “thrill” slides are absent.

In some countries, they are more commonly referred to as flumes, water chutes, or hydroslides.

Types of water slides
Slides may be straight or curvy, with a steep or gentle gradient. Large slides in thrill parks may be otherwise designed to maximize g-forces experienced by the rider and the “fear factor” involved with such amusement type rides. Sometimes, to add to the overall excitement of a water slide, names are used which are intended to increase the “fear factor”, such as the “Kamikaze slide”, although in fact the slides are quite safe for normal users. Like any amusement ride, slides may be built to include other features, such as interactive laser light shows or mist inside a tube, to add to the user’s desire/satisfaction complex.

Extreme slides
Extreme slides or speed slides are straight, with a near vertical drop in the middle designed to give the rider the most possible speed. These are called “plunge” or “plummet” slides, and are one of the most fearsome slides due to their height. They can accelerate people up to an average of 55 miles per hour. The tallest plummet slide in the world is Insano at 135 feet, which can bring riders up to 65,24 mph, located at Porto das Dunas Beach, a part of the Beach Park Resort in Fortaleza, Brazil.

Body slides
Other slides wind down a very curvy path which is not as steep, although some slides allow significant speeds to be obtained. The sharpest curves are typically completely enclosed or have high walls on the outside of the curve to prevent users from leaving the slide; thus these slides can be a long tube or alternate between an open chute and closed tube. G-forces experienced in these slides can range from gentle and family-friendly to surprisingly intense. Most riders will be required to lie flat on their backs, and cross their arms over their chest to prevent injury on these types of slides.

Tube/raft slides
Some slides are designed to be ridden with a tube or raft. These are commonly family slides, and some tubes allow up to 8 riders at one time. These are normally slow and include many twists and turns, and sometimes have pools along their length to simulate whitewater rafting.

Uphill slides
A small percentage of slides are hydro coasters. They shoot riders up and down with water or a conveyor belt. This is normally a “high intensity” water slide. A company called pro slide has recently developed a hydro magnetic water coaster. It uses LIMs to push the inner tube up the incline. The City of North Richland Hills, Texas operates a community owned water park that claims to have the worlds largest uphill water slide called The Green Extreme according to their advertising.

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A wave pool is a swimming pool in which are artificially generated reasonably large waves, similar to the ocean’s. Wave pools are often a major feature of water parks.

History
Several locations claim to have developed the first wave pool in the United States, including Big Surf in Tempe, Arizona, in 1969, and Point Mallard Park’s Aquatic Center, in the city of Decatur, Alabama. But Palisades Amusement Park, a famed center atop the New Jersey Palisades across the Hudson River from New York City, had a salt-water wave pool during the 1940s. This was a huge pool whose waves were generated by a waterfall at one end. The pool in Point Mallard Park was developed in the early 1970s after Mayor Gilmer Blackburn saw enclosed “wave-making” swimming pools in Japan and thought one could be a tourist attraction in the United States. J. Austin Smith, an Ohio wave pool manufacturer, worked with the city of Decatur to design and install the wave pool in 1970.

Operation
Wave pools replicate the movement of the ocean one of two ways, depending on the size of the pool and the size of wave desired. In small wave pools, pressurized air is blown onto the surface of the water, or a paddle creates force in the water, creating small ripple-like waves. Other techniques utilize an “accordion mechanism” which opens and closes in order to suck water into its belly (opening) and push it out (closing) to cause waves. However, in high-volume wave pools, a large amount of water is quickly allowed into the far end of the pool, forcing the water to even out, generating a sizeable wave. In these large wave pools, the excess water is removed by being channeled through a return canal where it can be used again to generate another wave.

Types and locations
Generally, wave pools are designed to use fresh water at inland locations, but some of the largest ones, near other seashore developments, use salt water. Wave pools are typically larger than other recreational swimming pools and for that reason are often in parks or other large, open areas.

Safety
Wave pools are more difficult to lifeguard than still pools, and there have been drownings in some. For example, the pool at New Jersey’s now-defunct Action Park took two lives, and kept the lifeguards busy rescuing patrons who overestimated their swimming ability. The moving water, sun glare, and other factors make them difficult for lifeguards.

Computer automated drowning detection systems do not work in wave pools. Drowning prevention systems such as Swimguard use underwater cameras and might improve safety.

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A zoological garden, shortened to zoo, is an institution in which living animals are exhibited in captivity. In addition to their status as tourist attractions and recreational facilities, modern zoos may engage in captive breeding programs, conservation study, and educational outreach. Zoos are a subject of controversy stemming from many sources, including the quality of life of the animals they exhibit, and the perceived necessity or purpose of exhibiting captive animals at all. Zoos are frequently criticized by animal rights groups.

Collections of wild animals existed already in the ancient civilizations of Mesopotamia, Egypt, and China. In medieval Europe some monarchs, monasteries, and municipalities continued to maintain collections of wild animals. The transition from menagerie, a predominantly private collection, to public institution marks the beginning of the modern zoo concept. Collections established during the nineteenth century began calling themselves zoological gardens. Throughout the nineteenth and twentieth centuries, many new zoos and related facilities were founded for very different motives and purposes.

Zoo professionals proclaim demanding aims for their institutions, from educating the public to conservation of biodiversity. Many zoos define their aims as recreation, education, research, and conservation. Animal-rights groups claim that there is a wide gap between these claimed aims and actual practice, and that zoos have commercial and entertainment purposes in mind as well as financial profit.

Types of zoo include urban, open-range, safari, animal theme, roadside, rescue, sanctuary, petting, and specialized. The most traditional form of maintaining wild animals in captivity is keeping them in cages constructed of concrete or metal, in aviaries, or fenced paddocks. Most zoological gardens incorporated within international umbrella organizations are led by professionals such as zoologists or veterinarians.

Etymology
The terms zoo and zoological garden, that refer to zoology (from Greek: zωο, zoion, “animal”; and λόγος, logos, “knowledge”), did not come into use until the modern zoo concept developed during the nineteenth century. The Zoological Society of London first used this term to describe its collection at Regent’s Park, although this collection was simultaneously referred to as a menagerie. Most zoo founders of the nineteenth century operated with the term zoological garden to distinguish their institutions from the aristocratic and travelling menageries. The abbreviation zoo first appeared in print in Britain about 1847, when it was used for the Clifton Zoo, but it was not until some twenty years later that the shortened form became popular by a song called “Walking in the Zoo on Sunday”.

Relatively new terms for zoos, which were coined in the late twentieth century, are conservation park or biopark. Adopting a new name is a strategy by some zoo professionals to distance their institutions from the stereotypical and nowadays criticized zoo concept of the nineteenth century. The term “biopark” was first coined and developed by the National Zoo, Washington, D.C. calling itself “Creating the Nation’s first Biopark” in the late 1980s. In 1993, the New York Zoological Society changed its name to the Wildlife Conservation Society and rebranched the zoos under its jurisdiction as “wildlife conservation parks”.

History

From ancient to modern times

Collections of wild animals existed already in the ancient civilizations of Mesopotamia, Egypt, and China.
The most abundant evidence of the earliest zoos from Egypt derives from burial sites of about 2500 BC to 1400 BC. Throughout the entire period, written records — on tablets, papyri, and tomb walls — describe how pharaohs and sometimes other power brokers made zoos for pleasure and prestige and to satisfy scientific curiosity. Rulers gathered many of their animals from distant lands, frequently setting forth on expeditions for that purpose or receiving their quarry as gifts from fellow leaders or conquered peoples. They kept hyenas, monkeys, various antelopes, and mongooses. Proud of their collections, they took pains to ensure that their acquisitions would thrive and reproduce. Indeed, they often employed handlers to care for finicky creatures. The ancient Egyptians began keeping wild animals in form of acclimatization which sometimes has approached domestication. On tomb pictures dating from 2500 BC, at Saqqara, some ungulates including antelopes, gazelles and ibex are depicted wearing collars and holding in leash. Egyptian Queen Hatshepsut established a zoo in Thebes around 1490 BC. Hatshepsut’s zoo contained exotic animals collected from what is today Somalia, and it included tall cattle, exotic birds, cheetahs, leopards, monkeys and a giraffe. During the Hellenistic period, Ptolemy I of Egypt (323-285 BC), who had a particular interest in natural history, founded a great zoo in Alexandria. His son Ptolemy II developed the Alexandria zoo into the greatest collection of animals the world had yet known. The animals were put on parade at the great ceremonies. In 285 BC, a typical procession for the feast of Dionysus included 96 elephants, 24 lions, 14 leopards, 16 cheetahs, 14 camels, a giraffe, a rhinoceros, hundreds of domestic animals as well as numerous birds.
In Mesopotamia, the kings of Sumeria, Babylonia, and Assyria were proud of their animal collections, which were symbol of power, wealth, and authority. The kings were especially proud of rare specimens their subjects and foreign dignitaries sent after diligent searches and difficult transport. Animals came from Asia via trade with the Indus society and from Africa via trade with the Egyptians. The earliest zoo with large carnivores as lions was probably in Sumer and was King Shulgi’s (2094-2047 BC) of the 3rd Dynasty of Ur. Babylonian and Assyrian royal parks and gardens were often a place to keep animals. Tiglath-Pileser I, King of Assyria (1114-1076 BC), kept herds of deer, gazelles, and ibex from conquered territories in his park. Ashurnasirpal II, King of Assyria (883-859 BC), had herds of wild bulls, lions, ostriches and apes. Sargon II, King of Assyria (721-705 BC), was particularly fond of lions and falcons. The richest evidence of the earliest zoos from Mesopotamia comes from Assyrian palace reliefs of about 880 BC to 627 BC. Bas-reliefs from Assyrian royal palaces show monkeys, antelopes, camels, elephants, and other species brought to the Assyrian kings as tribute. 7th century BC stone reliefs from Nineveh (now in the British Museum) depict the Assyrian king Ashurbanipal hunting lions, which seem to have been first caught and held in cages before being released and hunted to death. A relief on one of the palace walls particularly shows a scene of Lion Hunt where a captive lion is released from its transport crate into the animal park of Ashurbanipal, King of Assyria (668-627 BC) at Nineveh, Mesopotamia. Another well-known collector of lions was King Nebuchadrezzar II of Babylonia (605-562 BC). In ancient China, wild animals, especially exotic species, held the interest of rulers and the wealthy class. Starting with the founder of the Shang dynasty (ca. 1500 BC), China’s rulers built animal reserves. The Chinese empress Tanki, who ruled around 1150 BC, built a marble “house of deer”. However, it was Wen Wang, founder of the Zhou dynasty (ca. 1000-200 BC), who built the first well-known animal reserve, which he called Lingyou, commonly referred to as the “Garden of Intelligence”. A more accurate translation would be “Garden for the Encouragement of Knowledge”. This reserve and similar parks owned by the wealthy class of the Zhou period were large, walled-in natural areas that required their own staffs of administrators, keepers, and veterinarians, and housing a different animals like deer, fish, and “white birds with dazzling plumes”. The rulers of the Qin (221-206 BC), Han (206 BC-AD 220), Tang (618-907), and Song (960-1279) dynasties continued the fashion of large royal parks, where birds and mammals were kept in cages for personal pleasure and the demonstration of wealth and power. In the thirteenth century, Marco Polo described the royal menagerie of Kublai Khan (1215-1294), founder of the Yuan Dynasty, in Shang-tu, which maintained leopards, tigers, lynxes and elephants, as well eagles and falcons used for hunting. In 1417, Yung-lo, a Chinese Ming Dynasty emperor, organised an expedition to Africa to collect a giraffe; apparently the emperor had a menagerie that included a zebra and other African animals. The fifteenth century Chinese explorer Cheng Ho returned in 1422 from Africa with at least one giraffe and one zebra.

Also in the ancient Greek and Roman world live animal collections existed. In the fourth century BC, Greek animal collections enabled Aristotle to write the first systematic zoological survey, The History of Animals, which describes about three hundred vertebrates known at this time. His student, Alexander the Great, sent information and specimens back to Greece from his eastern campaign. Alexander’s travels east into Persia opened up a new source of animals for Grecian menageries. Historians have written many publications about extravagant and bloodthirsty spectacles in Rome, involving wild animals. The 19th-century historian W.E.H. Lecky wrote of the Roman games, first held in 366 BC: “At one time, a bear and a bull, chained together, rolled in fierce contest along the sand … Four hundred bears were killed in a single day under Caligula … Under Nero, four hundred tigers fought with bulls and elephants. In a single day, at the dedication of the Colosseum by Titus, five thousand animals perished. Under Trajan … lions, tigers, leopards, bears, elephants, rhinoceroses, hippopotami, giraffes, bulls, stags, even crocodiles and serpents were employed to give novelty to the spectacle …” However, little has been written about the facilities of keeping those animals. By the second century BC, wealthy and influential Romans were keeping aviaries, fish ponds and menageries to show their power and prestige. The Latin word vivarium referred to the stockyards and arenas where wild animals were held for public spectacles. In Rome there were extensive animal holding areas, called vivaria, associated with the arenas that citizens might view. These were menageries of a sort. Each Roman emperor had a menagerie for triumphal processions and official celebrations, especially gladiatorial exhibitions in which animals were killed. At the dawn of the Christian era the Emperor Augustus (29 BC-AD 14) is recorded to have had over 3,500 wild and tamed animals from his menagerie killed in 26 celebrations, including 420 tigers, 260 lions, 36 crocodiles, and a number of elephants and rhinoceroses.

In medieval Europe some monarchs, monasteries, and municipalities continued to maintain collections of wild animals. One of these collections was the Tower Menagerie in London.
In the New World, one of the earliest and most impressive collections of animals was that of the Aztec emperor Montezuma II in Tenochtitlan (now Mexico City). It contained several buildings and flight cages and numerous gardens, lakes, streams, and ponds for its birds, mammals and reptiles. Hundred of gardeners and animals keepers tended the collections and the grounds. Unfortunately, these animal collections were destroyed during the Spanish conquest (1519-1521) by Hernando Cortés. At the middle of the 16th century, Hessen was ruled by Landgraf Wilhelm IV. In 1571 this prince established a zoological garden at the Sababurg, the hunting castle in the heart of the Reinhards Forest not far from Kassel. The prime purpose of the wild animal park was at first to furnish the kitchens with meat. Since 1971, the heritage is Tierpark Sababurg. Menageries owned by monarchs and wealthy aristocrats can be seen as the predecessor institution of the modern zoological garden. One of these aristocratic menageries was the Versailles menagerie during the reign of Louis XIV. The oldest existing zoo, the Tiergarten Schönbrunn in Vienna, evolved from such an aristocratic menagerie, founded by the Habsburg monarchy in 1752.

Evolution of the modern zoo concept

The transition from menagerie, a predominantly private collection, to public institution marks the beginning of the modern zoo concept. Collections established during the nineteenth century began calling themselves zoological gardens. In some cases this was simply fashionable since zoos were considered professionally managed facilities, whether they were or not. In other cases there was an emphasis on education and science rather than on entertainment.

The first modern zoo, established particularly for scientific and educational purposes according to its founders, was the Ménagerie du Jardin des Plantes as part of the Muséum national d’histoire naturelle in Paris (1793). It was, significantly, laid out like a picturesque park — a semblance of Nature emphasized by Rousseau — while the buildings themselves housed caged animals as if in museum display cabinets. About thirty years later, the Zoological Society of London was founded in 1826 by Stamford Raffles. The Zoological Society of London stated in its charter that its aim was “the advancement of zoology and animal physiology and the introduction of new and curious subjects of the animal kingdom”. The members of the Zoological Society of London adopted the idea of the early Paris zoo when they established London Zoo as a scientific zoo in 1827. It opened in 1828 in Regent’s Park, admitting members and their guests. Only in 1847 were working people allowed in, for a shilling. London Zoo admitted paying visitors to aid funding of its scientific work. The taxonomic presentation of animals at the London Zoo became the model for the nineteenth century. The success of London Zoo set off a Victorian wave of similar establishments.

Wealthy citizens and interested scientists founded zoological societies following the standard of the Zoological Society of London. On continental Europe, the first of these societies was established in Amsterdam in 1838. It was the Zoologisch Genootschap Natura Artis Magistra (Zoological Society Natura Artis Magistra), which received the supplement “Koninglijk” (Royal) in 1852. In 1838, an appeal for the formation of a zoological society was published under the title, Natura Artis Magistra (Latin for Nature is the Master of Arts) and about 120 people joined the new society. Artis, as the Amsterdam Zoo is popular known, opened on May 1, 1838.

The Berlin Zoo, which is often said to have the most extensive range of species worldwide, was constructed in 1841 on the site of the former royal pheasant run in the Tiergarten at Charlottenburg. Friedrich Wilhelm IV not only donated in 1841 the site of his pheasantry to the newly-founded shareholders’ association Zoo Aktiengesellschaft, but in 1844 also donated 850 animals from the royal menagerie, which moved from Peacock Island (“Pfaueninsel”) to Tiergarten. The Berlin Zoo, the first in Germany, was opened on 1st August 1844.

The world’s first acclimatization society was the Société Zoologique d’Acclimatation, founded in Paris in 1854. The founding president was Isidore Geoffroy Saint-Hilaire, professor of zoology at the Muséum national d’histoire naturelle and director of the Ménagerie (created in 1793). In 1860 Isidore and his son, Albert Geoffroy Saint-Hilaire, opened Jardin Zoologique d’Acclimatation, located in the Bois de Boulogne, west of Paris.

The history of modern zoos in India began around the middle of the nineteenth century. The first zoo was probably Marble Palace Zoo, started in 1854 by Raja Mullick Bahadur in the private mansion in the center of Calcutta. There were many mammals and birds in this collection. In 1855, a zoo was set by the Municipality of Madras in a 20-acre (80,000 m2) area near the Railway station. It was closed down in 1980 and shifted to a new 1,260-acre (5.1 km2) site, known as the Arignar Anna Zoological Park, Vandalur. This is a modern zoo of India.

The Zoological Society of Victoria was established in 1857 and was the first to develop a major zoo in Australia. Its priorities had shifted from collecting and displaying exotic animals to importing large numbers of unusual domestic animals. To reflect this emphasis, the society renames itself the Acclimatisation Society of Victoria in 1861 and concentrated its efforts on acquiring useful animals. The animals in question fell into three broad categories: economic, game and ornamental. The Royal Melbourne Zoological Gardens opened on the Royal Park site in 1862.

The idea to create a zoological garden in Moscow came in 1857 when professors at the Moscow University established the first Society of Acclimatization in Russia. In 1862, the society was reorganized and given the name Tsar’s Society for the Acclimatization of Plants and Animals. In 1863, this society was eventually able to buy property for its future zoo, where it still exists. The opening ceremony of the Moscow Zoological Gardens took place on February 12, 1864. A second Russian zoological garden was opened only one year later. The St. Petersburg Zoo opened to the public at its present site on August 1, 1865. The Moscow Zoo was designated national property in 1919. The zoo in St. Petersburg was nationalized in 1919, the same year as the one in Moscow.

In the United States, physician William Camac initiated the incorporation of the Zoological Society of Philadelphia in 1859. According to the society’s charter, “The object of this Corporation shall be the purchase and collection of living wild and other animals, for the purpose of public exhibition at some suitable place in the City of Philadelphia, for the instruction and recreation of the people.” The American Civil War interrupted these efforts so that the opening of the Philadelphia Zoo delayed until July 1, 1874. Some years ago, the Central Park menagerie evolved from gifts of exotic pets and other animals informally given to the Park, beginning, apparently, with a bear and some swans deposited near New York’s arsenal on the edge of Central Park in 1859. About 1861/62, a smaller zoo with lower standards had been already established in New York City, the Central Park Zoo. In 1864 it received charter confirmation from New York’s assembly. The Baltimore Zoo actually had its beginnings as early as 1862, when the first of many citizens gave animals to Druid Hill Park for public display. It was officially created by act of Maryland state legislature on April 7, 1876. The Maryland state legislature had authorized the Baltimore Park Commission to establish a zoological collection. Lincoln Park Zoo in Chicago, Illinois, was founded in 1868, when the Lincoln Park commissioners were given a gift of a pair of swans. Roger Williams Park Zoo in Providence, Rhode Island was established in 1872 with a small collection of mostly native animals. The Zoological Society of Cincinnati was established in 1873. A site was acquired the following year, and the Cincinnati Zoo opened on September 18, 1875. Other zoos in the United States began as menageries, when animals were donated to a park system and city fathers had to find a place to house them. The zoos in Buffalo, New York (1875); Binghamton, New York (1875); and Cleveland, Ohio (1882) are examples of this type of “startup”. When the first American zoological gardens came into existence, only a few supporters of the early animal welfare movement spoke out against zoos. Humanitarians protested cruelty in training animals for circuses more often than they opposed zoos. Their concerns were that zoo animals were healthy and well cared for, and not subjected to cruelty or pain.

In March 1889 an Act of Congress authorized the formation of a National Zoological Park Commission to select an purchase land for a zoological park in the District of Columbia “for the advancement of science and the instruction and recreation of the people”. In April 1890 Congress passed another act, placing the National Zoological Park under the direction of the Smithsonian Institution’s Board of Regents. First animals arrived in 1891 at Washington Zoo. The New York Zoological Society (now the Wildlife Conservation Society) was incorporated in 1895. Objectives of the society were “to establish and maintain in New York a zoological garden for the purpose of encouraging and advancing the study of zoology, original researches in the same and kindred subjects, and of furnishing instruction and recreation to the people”. The New York Zoological Park (the Bronx Zoo, now the Wildlife Conservation Park) opened in 1899.

Ueno Zoo opened its gate in 1882 in heavily wooded Ueno Park, Tokyo, as part of the national museum, and was the first modern zoo in Japan. Kyoto Zoo was the second modern zoo in the country, opening in Okazaki Park, Kyoto, in 1903 to commemorate the wedding of the crown prince, who later became emperor. The birth of the third zoo followed in 1915 in Osaka, a municipal facility known as Tennoji Zoo. The imperial facility gave the Ueno Zoo to the City of Tokyo in 1924 to commemorate the wedding of another crown prince.

Throughout the nineteenth and twentieth centuries, many new zoos and related facilities were founded for very different motives and purposes. Cultural and philosophical attitudes as well as political developments such as imperialism had an impact on the appearance and aims of zoological gardens. Human beings were sometimes displayed in zoos along with non-human animals, supposedly to illustrate the differences between people of European and non-European origin (“Human zoos”). According to historians Eric Baratay and Elisabeth Hardouin-Fugier the zoos of that period reflected the determination of imperialist nations to classify and dominate.

In 1931, a small zoo was built by the Hagenbeck’s firm for the Colonial Exposition organized by Lyautey in Paris. The popular success of this temporary zoo inspired the Muséum national d’histoire naturelle to create a new zoological garden inaugurated in 1934 in the Bois de Vincennes, east of Paris.

The most important zoo in the former German Democratic Republic (GDR), the Tierpark Berlin-Friedrichsfelde, opened in 1955. Because of its connections and animal dealings with Eastern European zoos, it contains some of the rarest species. Its former connection with the Academy of Science of the GDR supported research at Tierpark Berlin-Friedrichsfelde. It became one of the leading zoos of the world with many rare breeding groups of birds and mammals.

In the 1950s, Bernhard Grzimek used the zoo and the zoological society of Frankfurt to popularize the idea of nature conservation. When ecology emerged as a matter of public interest through the 1970s, a few zoos began to consider making conservation their central role, with Gerald Durrell of Jersey Zoo, George Rabb of Brookfield Zoo, and William Conway of Bronx Zoo leading the discussion. Since then, zoo professionals became increasingly aware of the need to engage themselves in conservation. As a modern ark, the concept of frozen zoo had been added to both captive breeding (“ex-situ conservation”) and conservation in the wild (“in-situ conservation”). Especially in America, the new zoo concept had been developed. The changes at zoos have served both the ideology of environmentalism and the day-to-day needs of zoos to maintain their collections. Many of contemporary zoos led by professionals show fewer species and display social animals in groups; landscape immersion exhibits replicate animal habitats. The zoological garden of the nineteenth century eventually evolved into the biopark, or conservation park, of the late twentieth century. The conservation park concept is quickly being superseded with an even newer one, the environmental center of the twenty-first century. In effect, it is announced that the role of zoos will be changing in the 21st century. Instead of the living museums that they were in the 20th century, more and more zoos will become environmental resource centres in which ecosystems and survival of species are supported. It is also proposed that, as possible agents for conservation, visitors to zoos should play an active role in this process.

Aims

Zoo professionals proclaim exalting and demanding aims for their institutions, from educating the public to conservation of biodiversity. Many zoos define their aims as recreation, education, research, and conservation. Animal-rights groups claim that there is a wide gap between the claimed aims and actual practice, and that owners of zoos have commercial and entertainment purposes in mind to increase their financial profit. Some zoos work to save endangered species, but most animals in zoos are bred in captivity for the purpose of public display, not species protection. In his 1985 critique of zoos, philosopher Dale Jamieson asserted that zoos generally do not live up to their own goals, that zoo animals are deprived of freedom for little social or scientific good, and that zoos cause suffering without producing compensatory benefits for animals or people. Jamieson argues that a moral presumption against keeping animals in captivity outweighs any benefit that might accrue from education, science, or species preservation. The animal rights philosophy refuses zoos as a matter of principle. Keeping wild animals in captivity is seen as human domination over other creatures.

French historians Baratay and Hardouin-Fugier see zoos as an allegory for the contradictions of modern Western societies: “The zoo made concrete, in an enclosed space, what society wanted to do in nature, as, with the advance of urbanization, people felt an increasing need to preserve the wild. But the desire remained unrealized, because Western society did not want its methods called into question, and because, in the final analysis, it preferred to transplant, delimit, cultivate and arrange nature however and wherever it liked, rather than leave places truly free of human influence.”

Recreation

Recreation, which is close to entertainment and pleasure, does not benefit the welfare of the zoo animals, but that of the zoo visitors. Jamieson points out that “we should have the honesty to recognize that zoos are for us rather than for the animals”. According to Swiss zoologist Heini Hediger recreation is one of the most important aims of the modern zoo in the face of proceeding urbanization and alienation from nature. People, especially from urbanized areas, should be given the opportunity to relax and to enjoy a naturalistic environment in their very neighbourhood.

Education

Two pot-bellied pigs sleeping at the “Quintinha” (Little Farm), Lisbon Zoo. This is a place aimed at the education of school children.

Since the beginning of the modern zoological gardens education and therefore the propagation of biological knowledge has been one of the most prominent aims claimed by zoo professionals. Already in 1829, London Zoo published its first guide to the zoo. Today’s educational efforts of zoos concentrate mostly on ecological and conservation issues. The idea of conservation education at zoos has a longer history than it is often acknowledged. This idea was foremost among the goals of the Arizona-Sonora Desert Museum as it was planned in the early 1950s. Animal exhibits were one component of the museum, which was begun with the goal of educating the public about the plant life and scenic value of the desert. Although the museum’s focus was regional, and it was not a traditional zoo, directors of many American zoos looked to it as a model. Many zoos now have an education department, a classroom, and full time educational officers. Edinburgh Zoo has pioneered a scheme called “interlink” which combines the resources of the zoo, local museums, and the botanical gardens to create educational courses. Like several other zoos it offers teachers a range of courses from day trips with infants to intensive courses for advanced students. In 1991, over 50,000 students were involved with structured courses at Edinburgh Zoo. However, critics say that there is no educational value in exhibiting wild animals in artificial environments. According to them true respect for wildlife could only be stimulated by learning about animals in their natural habitat.

Research

Classical zoological gardens played a role in research in comparative anatomy and physiology in the nineteenth century. Important scientists, such as Cuvier, Alfred Brehm and Paul Matschie, used zoos for their studies.
As early as 1859 the Frankfurt Zoo published the journal Der Zoologische Garten (The Zoological Garden) as a public forum for scientific research and experience at zoos.

Oskar Heinroth, the director of the aquarium at the Berlin Zoological Gardens during the early decades of the twentieth century, coined the word ethology and was the first to articulate its general mission: a scientific study of animal behavior that would operate through comparative methods, like the already well-established of comparative anatomy.

Beginning in 1934, the brothers Lutz and Heinz Heck, two German directors of the Berlin and Munich Zoos respectively, did indeed experiment in “back-breeding” two species of extinct European ungulate: the aurochs (Bos primigenius) and the tarpan (Equus gmelini).

Heini Hediger developed zoo biology as a special branch of biology. Zoo biology translates the ideas and perceptions of others sciences into the practice of zoological garden management and gives stimulus to the use of zoo research in other sciences.

Contemporary research efforts focus on ethology and conservation breeding. According to William Conway zoo science would contribute basic biological information and technological know-how to the increasingly demanding tasks of wildlife care in constricted habitats.

Conservation

Up to now, only a few species such as the Przewalski’s Horse, the American Bison, or the California Condor could be saved from extinction and reintroduced to the wild. The American Bison, for example, was close to extinction at the beginning of the twentieth century. In 1907, the Bronx Zoo led by William T. Hornaday was the first zoo to help the American Bison Society with its reintroduction project, sending 15 bison to the Wichita Forest Reserve in Oklahoma. Other reservation herds were established in succeeding years using additional zoo-bred animals. By 1933, there were 4,404 bison in the United States and 17,043 in Canada. Although most species maintained in zoos are not endangered, and those that are will likely seldom be released into natural habitats, biologist Colin Tudge emphasizes the urgency of ex-situ conservation in zoos in the face of increasing threat to natural habitats.

In 1993, the World Association of Zoos and Aquariums (WAZA), formerly known as the International Union of the Directors of Zoological Gardens, produced its first conservation strategy. In November 2004, WAZA adopted a new strategy that sets out the aims and mission of zoological gardens of the twenty-first century. The captive breeding of endangered species is coordinated by cooperative breeding programs. Under the auspices of WAZA, 182 International Studbooks are kept. These studbooks are coordinated by the Zoological Society of London. About 810 animal species and subspecies are managed under cooperative breeding programmes at the level of the regional association members such as the Species Survival Plan (SSP), established 1981, or the European Endangered Species Programme (EEP), established 1985.

But critics point to the marginal contribution of zoos to the preservation of biodiversity. Andrew Linzey, director of the Oxford Centre for Animal Ethics, argues that zoos make a “minuscule contribution to conservation.” Most conservation experts agree that few of the rare or endangered species can be saved from extinction by breeding them in captivity. In 1990, the International Union for the Conservation of Nature (IUCN) drew up an action plan for the survival of 1370 species. It considered that the reintroduction of captive bred animals could assist in the conservation of only 19 species (1.4 percent). The difficulties associated with ex-situ conservation are illustrated by the captive breeding program for the critically endangered Sumatran rhinoceros. Between 1984 and 1996, 40 Sumatran Rhinos were transported from their native habitat to zoos and reserves across the world. After years of failed attempts and a dramatic decline of the captive population, one individual gave birth to a healthy male calf at Cincinnati Zoo in September 2001. This was the first successful captive birth of a Sumatran Rhino in 112 years. Two other calves followed in 2004 and 2007. Despite the recent successes in Cincinnati, the captive breeding program has remained controversial. Proponents argue that zoos have aided the conservation effort by studying the reproductive habits, raising public awareness and education about the rhinos, and helping raise financial resources for conservation efforts in Sumatra. Opponents of the captive breeding program argue that losses are too great; the program too expensive; removing rhinos from their habitat, even temporarily, alters their ecological role; and captive populations cannot match the rate of recovery seen in well-protected native habitats.

Types

Urban zoos

Urban zoos are the classical zoological gardens that stand in the tradition of the nineteenth century zoo concept, even if some of them changed their names to Conservation Park or Biopark. Most of them are relatively small in size and based within cities or urbanized areas, a fact that often complicates the construction of more sizable enclosures. In Europe a famous urban zoo is the Antwerp Zoo in Belgium, right next to the central station of the city. In the USA a good example is the Cincinnati Zoo.

Some zoos concentrate on animals of geographical regions (geozoo); other zoos have developed ecological exhibits based on ecosystems rather than geographical areas, or attempt to exhibit their animals in a different way of the opening by night (night safari). The Indianapolis Zoo, opened in 1988 in White River State Park, downtown Indianapolis, Indiana, was organized around the concept of biomes such as temperate and tropical forests, plains, deserts, and oceans. In 1994, the opening of the Night Safari, conceived by Sri Lankan Lyn de Alwis and developed by the team at the Singapore Zoological Gardens led by Bernard Harrison, created the simple but totally unique concept of simulating appropriate animal species in a national park, to be viewed only at night, with subtle theatrical lighting simulating moonlight. Some 1,000 animals can be seen in a tropical rainforest setting.

Open-range zoos

A number of open-range zoos have been established since the mid-1920s in rural surroundings. The prototype is Whipsnade Park, England, established by the Zoological Society of London on the Chiltern Hills in 1926 and opened in 1931 (600 acres, 2.4 km²). Urban zoos started to develop out of city zoos — commencing with Whipsnade for London, followed by such developments as Planckendael (1956) for the Antwerp Zoo and Tama (1958) for Ueno Zoo in Tokyo. Fewer species are exhibited in such zoos than in urban zoos, but they are mostly kept in more sizable enclosures. Conservation centers were established for the first time in the United States for the purpose of off-site captive reproduction and conservation at the San Diego Wild Animal Park (Escondido, California, 1972), St. Catherines Wildlife Conservation Center (Midway, Georgia, 1974), and Conservation and Research Center (Front Royal, Virginia, 1975). San Diego, New York and Washington Zoos respectively manage these centers, and all are off exhibits (not open to the public) except the San Diego Wild Animal Park. After 30 years of animal research, Bronx Zoo closed St. Catherines Island preserve at the end of 2004. In North America, the seventies witnessed a boom in so-called “utopian zoos”, sprawling complexes of several hundred acres often linked by trams or monorails. From San Diego (1972) to Toronto (1974), Minneapolis (1978) to Miami (1981), these elaborate facilities provided animals with vast territories to roam and offered visitors yet another version of zoo naturalism. The largest zoo in terms of size is the 1,800 acre (7 km²) San Diego Wild Animal Park in the Pasqual Valley, California, that is run by the Zoological Society of San Diego. In 1974 the Metropolitan Toronto Zoo was open to the public. Encompassing 710-acre (2.9 km2), it is located at Scarborough, Ontario. The Minnesota Zoo, opened in 1978, is a agency of the state of Minnesota. It was built in Apple Valley, Minnesota, a suburbanizing rural area of Minneapolis-St. Paul, and organized its animals by their living environment, featuring outdoor and indoor themed walking trails: Minnesota Trail, Northern Trail, and Tropics Trail. The Werribee Open Range Zoo near Melbourne, Australia, concentrates on displaying animals living in a wide open savanna. This 500-acre (2.0 km2) zoo is managed by the Zoological Parks and Gardens Board which also manages Melbourne Zoo. One of only two American state supported zoos is the North Carolina Zoo located in Asheboro, North Carolina and opened in 1976. At 1,458-acre (5.90 km2), it is the largest walk-through natural-habitat zoo. The almost 1,500-acre park includes a 300-acre (1.2 km2) recreation of Africa’s wilderness and a 200-acre (0.81 km2) representation of North America’s landscape.

Safari parks
A safari park is a zoo-like commercial tourist attraction where visitors can drive in their own vehicles and observe the wildlife, rather than viewing animals in cages or small enclosures. Most safari parks were established in a short period of ten years, between 1966 and 1975.

Animal theme parks
An animal theme park is a combination of an amusement park and a zoo, mainly for entertaining and commercial purposes. Marine mammal parks such as Sea World and Marineland are more elaborate dolphinariums keeping whales, and containing additional entertainment attractions.
Another kind of animal theme park is Disney’s Animal Kingdom in Orlando, Florida (550 acres, 2.2 km²) or Busch Gardens Africa in Tampa, Florida (335 acres, 1.36 km²). These commercial parks are similar to open-range zoos according to size, but different in intention and appearance since they contain far more entertainment elements (stage shows, roller coasters, mythical creatures etc.).

Roadside zoos
There are hundreds of substandard wildlife attractions throughout the United States and Canada called roadside zoos. These mainly amateur facilities are usually privately owned and occasionally accredited by the American zoo organization AZA. The focus is on amusing customers, rather than on meeting the needs of the animals. Roadside zoos often lack trained, experienced animal care staff, proper funding and safety practices. Animals are confined to small, barren, often filthy cages, and suffer poor welfare as a result of inadequate housing, care and diet. Roadside zoos breed animals in order to have a constant supply of cute babies to attract the public. Big cat rescues, primate rescues, and native wildlife rescues are overwhelmed due to the constant influx of animals coming out of roadside zoos.

Rescues and sanctuaries
Animal welfare supporters have funded the construction and set-up of sanctuaries for wild animals. The animal welfare organization WSPA established several of these facilities for rescued bears worldwide. According to the organization those in Greece and Turkey have helped stamp out the tradition of forcing bears to perform tricks for public entertainment. Another type of sanctuary takes the form of a rehabilitation and release center. An example of this is the Idaho Black Bear Rehabilitation Center, where orphaned bear cubs are cared for and prepared for release back into the wild. Another sanctuary, especially for apes and primates, is 65 acre (0.26 km²) Monkey World near Wool, Dorset, England. Set up in 1987 it was originally intended to provide a home for abused chimpanzees used by Spanish beach photographers, but is now home to many different species of primates.

Petting zoos
A petting zoo, also called children’s farms or children’s zoos, features a combination of domestic animals and wild species that are docile enough to touch and feed. To ensure the animals’ health, the food is supplied by the zoo, either from vending machines or a kiosk nearby.

Specialized zoos
Some zoos specialized on specific groups of animals such as bird parks (public aviaries), reptile zoos (reptile centre, serpentaria), public aquaria or butterfly zoos.

Exhibitry

Traditional enclosures and new approaches
The most traditional form of maintaining wild animals in captivity is keeping them in pits (“bear pits”), in cages constructed of metal bars or concrete, in aviaries, or fenced paddocks, although many zoos replaced these by more elaborate and larger enclosures that attempt to replicate their natural habitats, for the benefit of the animals and the visitors.

The traditional structures in exotic styles in zoological gardens of European cities in the nineteenth century were thought appropriate as the home of wild creatures from foreign parts: the Egyptian temple in Antwerp Zoo (1856), the Moorish-looking elephant house at the Cologne Zoo (1863), the Indian pagoda for elephants in Berlin Zoo (1873), the Turkish elephant house at Basel (1891). The first exotic design for a zoo building was the Egyptian temple at the Antwerp Zoo. Antwerp’s Egyptian temple was a faithful reproduction of an ancient temple on the Isle of Philae. It was built for elephants, giraffes and zebras, in 1856. Its architect, Charles Servais, used the Egyptian style for all kinds of African animals. Following the example of Zoo Antwerpen in Belgium, some of the Berlin Zoological Garden’s houses were built in a picturesque, exotic style. Accordingly, 1871 witnessed the opening of the magnificent Antelope House in the Moorish style. This building was also the Giraffe House, which was elliptical in plan, was decorated with four minarets, each pierced with a large golden sphere. The Antelope House was followed by the Indian style Elephant House (1873), the Japanese Wader House (1897), the picturesque Elephant Gate (1899), the Egyptian Ostrich House (1901), the Indian Bison House (1905), the Russian Wisent House (1905), the Siamese Buffalo House (1907), and the Arabian style houses for solipeds (1910). The most remarkable example of the exotic style of zoo architecture was the Indian temple at Berlin Zoo or Elephantpagode. The magnificent elephant house was built in the form of a Hindu temple, with domes painted yellow, brown and blue. Huge columns supporting the roof have carved elephants’ heads for capitals, and in the centre of the house stood the skeleton of a full-grown elephant. It was used for about 70 years until bombing during World War II destroyed it. The house for wading birds (i.e. cranes and storks) was based on Japanese architecture and stood from 1897 until 1943 when it was destroyed by the war. Also in the Japanese style, the entrance to the Berlin Zoo on Budapester Strasse is the reconstructed Elephant Gate of 1899 that was completely destroyed in the last war and resurrected in all its original detail in 1984. The Egyptian temple for ostriches opened its doors in 1901. The ostrich house, based on Egyptian architecture, was decorated both inside and out with copies of Egytian murals, and on the back wall of the public area two immense figures, painted in a sitting position, were bathed in a deep and glorious sunset. It was destroyed during the war in 1943. Two other houses, the Russian blockhouse for European bison and the Indian blockhouse for American bison are still extant. Built in 1905 this Indo-Russian double blockhouse is home to the American bison on the one side and the Eurasian bison on the other. The American Bison House reminds visitors of a Canadian timber house. Its facade is ornamented with Native American paintings and totem poles of Pacific Northwest Indians are faithfully reproduced in front of the building. The house for the European bison was built like a Russian wooden manor house. The Berlin Zoo’s Siamese Cattle House (1996) is the biggest Thai building in Europe. The new house, used for gaur and banteng, resembles an earlier (1907) one destroyed in World War II. An animal house in the Arab style, Persian tower stable, since 1910 is predominantly accommodation for equine species animals.

German merchant Carl Hagenbeck developed a new form of animal exhibition at the beginning of the twentieth century. When he opened his private owned zoo at Stellingen near Hamburg, (Tierpark Hagenbeck) in 1907, Hagenbeck had broken with a strong tradition to exhibit animals in accordance with taxonomy. He created a new style of exhibition based on ecological and geographical habitats including different species. For example, the “Northern Panorama” exhibited seals and walruses in a pool in the foreground, with reindeer behind them, and polar bears behind the reindeer. In the “African Panorama”, the foreground pond had ducks and flamingos; behind them were large plains with zebras, antelopes, and ostriches; behind them were lions and vultures at the foot of an artificial mountain, on which were ibex or barbary sheep. The different enclosures were divided with moats not visible to the public, and the successive enclosures were higher than the one in front. The exhibits were landscaped with plants and artificial rocks. The artist for the artificial rocks was Urs Eggenschwyler. This gave the public the impression they were seeing the animals together in one natural habitat. After initial skepticism, many zoological gardens throughout the world adopted Hagenbeck’s ideas and replaced traditional enclosures. Edinburgh Zoo, for example, was one of these institutions inspired by Hagenbeck’s new design. Then there are the extraordinary artificial mountains of concrete, like the Mappin Terraces in London Zoo, designed in 1913-1914 by Peter Chalmers Mitchell and John James Joass. Eventually, whole zoos, such as those in Rome (1911), Munich (1928), Detroit (1928), and Vincennes (1934), followed Hagenbeck plans. Brookfield Zoo, opened in 1934, is known throughout the world for its extensive use of open-air, unbarred enclosures and natural barriers such as moats. In 1941 the African Plains exhibit, the first free-range, multispecies habitat, opened at the Bronx Zoo. The innovative, open habitat is a 4-acre (16,000 m2) moated area featuring a savanna environment recreated for zebras, antelopes, and other grazing animals and birds, with lions kept apart on an island on the other side of a moat. Even if this kind of exhibiting animals to the public was revolutionary in the history and evolution of zoo design, the actual space provided to the animals remained relatively small and was, in fact, not different from that of the traditional enclosures. The new panoramas benefited the aesthetic sense of visitors and can be seen as mainly anthropocentric constructions.

At the beginning of the twentieth century, new approaches were also made to integrate modern style into zoo architecture. The Jugendstil buildings (1909-1912) at Budapest Zoo in Hungary were ornamented with carved animals. The Jugendstil pavilions of the Elephant House date of 1911 and were designed by Károly Kós.

During the 1930s, some attempts were made to introduce abstract design into the modern zoo architecture, like those famous abstract geometrical structures by Lubetkin in Regent’s Park, Whipsnade and Dudley. London Zoo’s Gorilla Pavilion was designed in 1932-1933 by the influential Tecton architectural firm, led by Russian emigre Berthold Lubetkin. The Round House is circular so that a half-drum shaped screen could be slid from within one half of it to enclose the other in cold weather, as a protection for the gorillas it was built to house. London Zoo’s penguin exhibit designed in 1934 by Berthold Lubetkin and the Tecton Group was a icon of the Modern Movement with its sweeping, interlocking concrete ramps above the pool.

From the 1950s on, first attempts were made to integrate the behavioural needs of the animals into zoo design. This approach based on the ideas of Swiss zoologist Heini Hediger who published his book Wild Animals in Captivity in 1942, translated into English in 1950. In this work he gave cogent arguments for a biological and particularly behavioural approach to zoo design and animal care. But the attempts to integrate the knowledge about animal behaviour into zoo design were often ineffectual and not consequently implemented. More important than behaviour and welfare of the animals remained hygienic aspects and, above all, architectural innovation such as New Brutalism. The Elephant and Rhino Pavilion at London Zoo, designed by Hugh Casson and Neville Conder, and built 1962-1965, is such an example. Most enclosures constructed from the 1950s to the 1970s were sterile and small cages made of concrete or ceramic tiles. Meeting hygiene standards became important which resulted in enclosures resembling bathrooms. Few zoos adopted these techniques of “sanitary modernist” design more thoroughly than the one in America, Philadelphia Zoo which opened exhibits Carnivora House in 1951, Monkey House in 1958 and Rare Animal House in 1965. In 1963, the Tierpark Berlin-Friedrichsfelde opened the Alfred Brehm House for carnivores and tropical birds. This structure was for a long time the largest animal house in the world and the only one Cat House with indoor barless enclosures for lions and tigers. This structure houses a huge aviary containing many species of birds. The aviary is flanked by cages of wild cats and by terrariums of reptiles, and the whole is overgrown by exotic tropical vegetation.

At the end of the twentieth century, new approaches were made to transform the appearance of hippopotamus exhibits. The so called “hippoquarium” is a term coined by the Toledo Zoo. The Toledo Zoo has an underwater hippo exhibit, but not the first or only one, the Sedgwick County Zoo (Kansas) built an underwater hippo viewing area in 1973. Opened in 1997, the new Hippopotamus House at Berlin Zoo is a hippopotamus aquarium, spanned by two fine-meshed glass domes where visitors can watch both above and underwater.

Due to limited space and a lack of financial means it still remains difficult to construct adequate enclosures, particularly for large animals and their requirement for a sizable territory. According to animal rights groups, zoos lacking the financial means or the interest in constructing more elaborate enclosures still keep their animals in inadequate conditions. These conditions can cause stereotypic behavior. Elephants in zoos can also often suffer from arthritis and foot disease. Only some zoological gardens are able to raise enough funds and have sufficient space to build more adequate enclosures for these animals. Such an example is urban Cologne Zoo, Germany, which opened in 2004 an indoor and outdoor elephant enclosure of about five acres. Norman Foster’s new addition to Copenhagen Zoo opened in June 2008 as an extension of Frederiksberg Gardens, the royal park in Copenhagen. The new Elephant House covers approximately 10% of the entire zoo site. At the end of 2001, the London Zoo’s Asian elephants were moved from Regent’s Park to Whipsnade Wild Animal Park in Bedfordshire, ending a 170-year tradition of keeping elephants at the city site. In the spring of 2003, the herd of five African elephants at Longleat Safari Park had been transferred from the Wiltshire park to a new purpose-built facility at the ZooParc de Beauval at St Aignan in France. In 2006, three American zoos (Lion Country Safari, Philadelphia Zoo, Gladys Porter Zoo) announced the closure of their elephant exhibits due to a lack of space. Two other zoos, Bronx Zoo and Santa Barbara Zoo, announced the phase-out of their elephant exhibits.

Landscape immersion

During the 1980s many zoological gardens, first in the United States, changed their policy of designing animal enclosures. The so called “landscape immersion”, a term coined by Seattle architect Grant Jones, transformed visibly the outlook and appearance of many zoos throughout the United States. The idea and concept of landscape immersion combines a naturalistic and realistic imitation of natural habitats with the environmental needs of the animals. It was developed by several landscape architects during the wholesale renovation of Woodland Park Zoo in Seattle in the late 1970s encouraged by zoo director David Hancocks. The first landscape immersion exhibit, an enclosure for gorillas, designed by Johnpaul Jones, opened in 1978 at Woodland Park Zoo. For the first time, zoo gorillas had trees to climb, places to hide, a complex landscape to explore, and live vegetation to interact with. According to the original idea and philosophy of landscape immersion the visitors are given the sense they were actually in the animals’ habitat. Buildings and barriers are hidden and vegetation plays a dominant role. In New York City, at the Bronx Zoo, the Congo Gorilla Forest, a 6.5-acre (26,000 m2) exhibit, which opened in July 1999, is the largest simulation of an African rainforest ever built. It is home to more than 300 animals, including the largest breeding group of lowland gorillas in North America. One of the best examples in Germany is the Erlebnis-Zoo Hannover (Hanover Zoo), an EXPO 2000 project, now featuring six different zoo worlds.

Specific forms of exhibit that can also be referred to landscape immersion are walk-through enclosures and walk-in aviaries. A few European zoos had already realized such exhibits before the term landscape immersion was coined. These ideas were integrated into the concept of landscape immersion and consequently advanced. In contemporary zoos, there are a lot of walk-through exhibits where visitors enter enclosures of non-aggressive species, particularly for birds and small primates. Visitors are asked to keep to paths and avoid showing or eating foods that the animals might snatch. The animals are not tame. One example is Apenheul, a primate park opened in 1971 at Apeldoorn, Netherlands, where visitors can get into direct contact with squirrel monkeys and lemuridae on moated islands.

Associated with these changes of zoo design are large tropical indoor exhibits. Bronx Zoo’s 37,000-square-foot (3,400 m2) Asian rainforest “Jungle World”, opened in 1985, is a pioneer exhibit of its kind. The exhibit is a masterful mix of the real and artificial, with live plants sprouting from vegetation sculpted from plastic, rubber, and epoxy. The display features more than 100 species of tropical plants, rocks and ledges crafted from concrete and fiberglass, and naturalistic murals artfully merged with the terrain. To add authenticity, it also features five waterfalls, numerous pools ans streams, machine-made clouds, and background sounds that replicate the ambience of a real jungle. The “Lied Jungle” at Omaha’s Henry Doorly Zoo, opened in 1992, is said the largest indoor rainforest in the world; it occupies an 80-foot (24 m) tall building that spans 1.5-acre (6,100 m2). Zürich Zoo opened Masaola Hall in June 2003. The Madagascaran Rainforest Hall covers a space of 2.7-acre (11,000 m2) where the public is able to walk and watch exotic species roaming freely. All the animals, lemurs, birds, fruit bats, reptiles, frogs, fish and insects are native to Madagascar and other Western Indian Ocean islands. With its dimensions of 90 m width, 120 m length and 30 m high, this is one of the biggest artificial rainforests in the world. Leipzig Zoo, Germany, is currently building a similar, but more giant project, the so called “Gondwanaland”.
Burgers’ Zoo at Arnhem, Netherlands, is widely known as being innovative in presenting major indoor displays on an ecological base. There are Burgers’ Bush (1988), a tropical rainforest in a greenhouse of 3.7-acre (15,000 m2), the Mangrove Hall (1991), Burgers’ Desert (1994), an American desert environment in a greenhouse of 1.85-acre (7,500 m2), and Burgers’ Ocean (2000), displaying a coral sea in aquarium containing 8 million liters of water. The Bush is 150 m long, 95 m wide and 20 m high. From the Bush, visitors have access to the Desert by way of a long underground tunnel, as well as to the Ocean.
The Desert Dome, an indoor desert, opened in April 2002 at Omaha’s Henry Doorly Zoo, and the Kingdoms of the Night, a nocturnal animal exhibit, opened beneath the Desert Dome in April 2003. It is the world’s largest glazed geodesic dome and both levels make up a combined total of 1.92-acre (7,800 m2). The Desert Dome has geologic features from three deserts around the world: Namib Desert of south Africa; Red Center of Australia; and the Sonoran Desert of the southwest United States. The Kingdoms of the Night features a wet cave (with a 14 ft/4.3 m deep aquarium), a canyon, an African diorama, a Eucalyptus forest, a dry batcave, and a swamp.

The transformation of zoos according to the concept of landscape immersion is slow and still in progress since the changes require extraordinarily financial and technical expenditures.

Special enclosures

Special climate conditions are created for animals living in radical environments, such as penguins which are kept in refrigerated rooms. Special enclosures for reptiles, amphibians, insects, fish, and other aquatic life forms have also been developed.

London Zoological Gardens opened the first Reptile House (1849), the first public aquarium (1853), and the first Insect House (1881). There has been a “vivarium” at the London Zoo since 1849 when a reptile house was converted from the Cat House and was the first Reptile House to be established in the world. The world’s first public aquarium, or Fish House as it was known for most of its innovative life, was opened in May 1853. The word “aquarium” also originates at London Zoo, beforehand the term for a fish enclosure was Aquatic Vivarium. What would today be called an insect or invertebrate house was opened in 1881 when a steel-and-glass structure usurped what had previously served as a refreshment room.

In America, zoos planners adopted a style of display in reptile houses similar to the habitat dioramas that had become popular in American natural history museums: they put the animals in glass-fronted cages, with foliage and a painted backdrop, arranged around the perimeter of an exhibition hall. Lighting the cages and keeping the hall dark, as in museums displays, reduced glare on the glass and focusing attention on the animals. Zoos that could afford to do so housed these small-scale natural settings in massive buildings — museum like buildings that conveyed scientific and cultural authority. The Reptile House at the Cincinnati Zoo is the oldest zoo building in America, dating from 1875. Crocodiles, snakes, turtles, frogs, and a reptile nursery are exhibited at the Bronx Zoo’s World of Reptiles in a historic building dating back to 1899. The St. Louis Zoo opened a reptile house in 1927. The facilities built specifically for snakes, lizards, frogs and other amphibians are inside a Mediterranean-style stucco building with a red tile roof. The National Zoo’s Reptile House opened in 1931.

In 1910, the old Berlin Aquarium, founded by Alfred Brehm, closed and Berlin Zoo shareholders’ association decided a new aquarium should be built at the Berlin Zoo. The new building, planned by Oskar Heinroth and opened in 1913, was to be much more than just an aquarium. Its three storeys were home to sweetwater and saltwater fish, reptiles, amphibians, and a large number of invertebrates. On the first floor was an aquarium, on the second a terrarium, and on the third an insectarium. Inside was created the first walkthrough enclosure in the center of the aquarium. This large hall for crocodiles extended up through the three floors. From the aquarium floor the crocodiles could be seen swimming underwater through large windows. On the second floor a bridge led through a tropical river exhibit with sandbanks where the crocodiles lived. And from the third floor the exhibit could be seen into the glasshouse from above. The aquarium was destroyed in 1943 during World War II, but the building was restored with its original floor plan through the 1950s.
The Frankfurt Zoo aquarium inaugurated in 1928 was destroyed in 1944 during World War II. It was reopened in 1957 and substantially enlarged. It became the Exotarium where climatic landscapes and endangered reptiles can also be seen. A hall of climatic landscapes was added, featuring a tropical riverbank with birds, reptiles, and fish. In a polar landscape, where cooling units produced artificial ice and bacteria filters cleaned the air, seals and penguins could be seen through underwater windows. At the aquarium section, 14 large tanks were arranged in geographic order to show, for example, South Sea reefs, a Black Forest river, and Amazon’s dark water streams. In the reptile hall, where visitors walked through vegetation, glass roofs could be moved to allow direct sunlight to reach the animals, and in the crocodile area a tropical thunderstorm was presented daily.
In the Basel Zoo, there is a large Vivarium (“Aquarium”/“Terrarium”) with freshwater and marine species of fish and invertebrates, penguins, reptiles and a few amphibians. Basel Zoo’s Vivarium opened its doors in 1972 and represented already by its structural concept a characteristic. The “vivarium” offers an interactive tour of the world depicting the story of evolution on earth. The 350 meters long visitor course leads first under the surface of the pond and penetrates always far into the depth of the oceans and the evolution following again up to the country. Unnoticed the visitor on its way turned around 360 degrees.

Zoos may have nocturnal houses, special buildings designed for nocturnal animals, with dim white or red lighting used during the day, so the animals will be active when visitors are there, and brighter lights at night to help them sleep. These exhibits reverse day and night so that visitors can see in human daylight hours some of the activities of the animal world that moves mostly after dark. The exhibits inside invert the life cycle of the animals by using strong artificial light during exterior darkness, and red light, which is invisible to most nocturnal animals, during human daylight. Thus they and their lifestyle can be observed.
The Bristol Zoo developed the first example of a nocturnal house with reverse lighting in 1953. The phenomenon was soon reproduced in zoos all over the world. The Antwerp Zoo’s Nocturama had been opened for the creatures of the night in 1968. The Bronx Zoo’s World of Darkness, a building exhibiting nocturnal reptiles, birds and mammals, opened in 1969.
The Grzimek House for Small Mammals at Frankfurt Zoo is famous for its nocturnal displays. This big structure was the Grzimekhaus opened in 1978, a three-level building located to a great extend underground. It was the first specially constructed house of this dimensions, and is still one of the largest, most modern, and most complicated constructions of its kind. Some 50 artificial habitats accommodate some of the rarest animals. The building was divided into two sections. Half of the house is a nocturnal section, where the light regime has been reversed to present nocturnal animals during their activity phase. The other half is a daylight section for diurnal animals. The nocturnal exhibit concept exists also in a new form such as a walk-through approach. An example is Amersfoort Zoo, Netherlands, where a walk-through nocturnal exhibit opened in 2003.

Management and animal care

Cooperation

Related and similar institutions in aims, staff and history are public aquaria. At the time when the first zoological gardens were established during the nineteenth century also public aquaria came into existence. Today, both zoos and public aquaria are integrated in the same national and international umbrella organizations. These zoo associations proclaim to force their members to achieve certain standards in animal management, veterinary care, aims, and stewardship.

The International Species Information System (ISIS), a computer-based inventory system, was established in 1973 to facilitate collection and population management for wild animals maintained in captivity.

Staff

Most zoological gardens incorporated within international umbrella organizations are led by professionals such as zoologists or veterinarians. Typical departments and subdepartments include the animal collection with live mammal, bird, reptile and amphibian, fish and invertebrate inventories. Curators plan for the development, maintenance, and growth of the animal collection and animal care staff. They are responsible for the acquisition of animals and play a role in the administration of captive breeding programs. They also participate in scientific conferences, write scientific papers, or assist in exhibit design.
Veterinarians provide medical care for ill or injured animals including surgery, vaccinations and physical exams. They also develop and implement preventive health care, or help determine healthful animal diets.
Responsible for the actual care of the animals within these institutions are zookeepers. The training of a zookeeper is very broad and covers many areas of modern animal husbandry, basic veterinary knowledge, behavioural biology knowledge. Daily basic duties of zoo keepers include cleaning and maintenance of animal enclosures and feeding of the animals. Some keepers prepare animal diets, report and record animal’s health and behaviour, or assist veterinarians. The educational requirements for an entry level zoo keeper vary but are often a college degree in zoology, biology or an animal-related field. Some colleges offer programs oriented towards a career in zoos. Job advancement is also possible but more limited than in some other careers requiring a college degree. Some zoos, particularly roadside zoos, are private-owned amateur facilities with a lack of well trained personnel.

The organisation of animal care staff depends on zoo architecture and enclosure design.
Traditionally, the live exhibits were often organized by taxonomy, resulting in clusters of carnivores cages, bird aviaries, primate exhibits, and so on, which led to sections within a zoo cared for by specialized keeper staff. Some keepers can become highly specialized such as those who concentrate on a specific group of animals like birds, great apes, elephants or reptiles.
Modern habitat exhibits attempt to display a diversity of species of different animal classes within one enclosure to represent ecosystem concepts. Groups of enclosures are organized by themes, relating to, for example, zoogeography and bioclimatic zones, rather than taxonomy. The shift in exhibit arrangements is changing the scope of work for curatorial staff and animal keepers, as they become habitat keepers, with a necessary working knowledge of living environment care, including landscape maintenance, plant care, climate control, and expanded knowledge of animals husbandry for many more species across taxonomic classes.

Animal care

The physical health as well as the social and behavioral well-being of zoo animals depends on enclosure design, nutrition, husbandry, management practices, group social structure, behavioral enrichment, preventive medicine, and medical and surgical care.

Proper feeding management of wild animals in captivity incorporates both husbandry skills and applied nutritional sciences. As a basic foundation of animal management, nutrition is integral to longevity, disease prevention, growth and reproduction.

Most contemporary zoos led by professionals are aware of environmental enrichment, also called behavioral enrichment, as a part of the daily care of animals. Environmental enrichment refers to the practice of providing animals with environmental stimuli. The goal of environmental enrichment is to improve an animal’s quality of life by increasing physical activity, stimulating natural behaviors, and preventing or reducing stereotypical behaviors.

The use of behavioral training has often allowed zoos to improve dramatically their ability to care for animals, while reducing animal stress and increasing safety for both keeper and animal during care procedures.

But sometimes even those zoos proclaiming high standards can fail to meet them in some way. Accidental deaths during the six months of animal stocking preceding the opening of Disney’s Animal Kingdom were investigated by the United States Department of Agriculture (USDA) in 1998. After a series of publicized animal deaths at the Smithsonian Institution’s National Zoological Park (National Zoo) in early 2003, the National Academies released an interim report in 2004 and an final report in 2005. Another example is the captive breeding management of great apes where these animals and their infants are traded and shuttled from place to place.

Because they wanted to stress conservation issues, many large zoos stopped the practice of having animals perform tricks for visitors. The Detroit Zoo, for example, stopped its elephant show in 1969, and its chimpanzee show in 1983, acknowledging that the trainers had probably abused the animals to get them to perform.

Some zoo practices in countries without animal protection laws would be illegal in many countries. Some examples include in 2008 the practices of Chinese zoos:

Badaling Safari World, a.k.a. the “Badaltearing Safari Park” (China) cited by journalists, encourages zoo visitors to throw live goats into the lions’ enclosure and watch them being eaten, or purchase live chickens tied to bamboo rods to dangle into lion pens. Visitors can drive through the lion’s compound on buses with specially designed chutes leading into the enclosure into which they can also push the live chickens.

Xiongsen Bear and Tiger Mountain Village (near Guilin in south-east China) feed live cows to tigers to amuse visitors.
Qingdao Zoo, (near Beijing, China) allows visitors to engage in “tortoise baiting”, in which they are encouraged to throw coins at the turtle’s heads. The turtles have elastic bands around their necks, so that they can’t retract.

Acquisition and surplus of animals

Zoos acquire animals through captive breeding programs, trade among zoos or collecting from the wild. The collection, trade, and transport of wild animals is regulated by government agencies.

At the beginning of the twentieth century, animals were caught in the wild; at the end of the twentieth century, many species are bred in zoos using sophisticated, and expensive, scientific procedures. For example, in 1910, the Bronx Zoo exhibited 1,160 species but recorded only 86 births. In 1993, it had 633 species and 1,253 births.

The World Zoo Conservation Strategy published in 1993 stated “that the commercial wild animal trade as a source of zoo animals should cease as soon as possible. Such animals as must be collected from the wild, must be collected for specific educational and conservation purposes. They should not be chosen from dealers’ lists of animals randomly collected for commercial purposes.” These goals, while closer than in 1993, are still valid in The World Zoo and Aquarium Conservation Strategy published in 2005.

It is general practice for zoos to obtain animals from each other, usually by exchange, as loans or gifts, and in some countries, when rescued from unsuitable circumstances.

Controversy surrounded the importation of seven African elephants (an officially endangered species) from the wilds of Swaziland to the San Diego Wild Animal Park in 2003, despite offers to move the elephants to reserves elsewhere in Africa. Prior to the import, three resident elephants were shipped to Chicago’s Lincoln Park Zoo, where all three elephants died within two years. There have been births from the Swaziland elephants since coming to the Wild Animal Park. In 2008, the Wild Animal Park houses eleven African elephants in a 3 acres (12,000 m2) enclosure.

Zoos participating in breeding programs are responsible for the regulation of their animal collections. Euthanasia might be considered for surplus individuals.

The downside to breeding the animals in captivity is that thousands of them are placed on “surplus lists”, and sometimes sold to circuses, animal merchants, auctions, pet owners, and game farms. The San Jose Mercury News conducted a two-year study that suggested of the 19,361 mammals who left accredited zoos in the United States between 1992 and 1998, 7,420 (38 percent) went to dealers, auctions, hunting ranches, unaccredited zoos and individuals, and game farms. Some zoos have advertised surplus animals in the Animal Finders’ Guide, a newsletter in which the owners of hunting ranches post notices of sales and auctions.

In 2008, deputy director of Nuremberg Zoo, Germany, said: “If we cannot find good homes for the animals, we kill them and use them as feed.”

A German Greens Party politician alleged in March 2008 that hundreds of the Berlin Zoo’s 23,000 animals are missing, amid allegations that they have been slaughtered, and that some tigers and leopards were sent to China to make drugs for traditional Chinese medicine. The Director of the zoo replied by saying he believes his detractors are spreading “untruths, half-truths and lies”.

Regulations
Many countries have legislation to regulate zoos that requires these institutions to be licensed and inspected. Zoo regulation is usually supported by written standards relating to species, exhibits and management.

In the United States, any public animal exhibit must be licensed and inspected by the United States Department of Agriculture, United States Environmental Protection Agency, Drug Enforcement Agency, Occupational Safety and Health Administration, and others. Depending on the animals they exhibit, the activities of zoos are regulated by laws including the Endangered Species Act, the Animal Welfare Act, the Migratory Bird Treaty Act of 1918 and others. Additionally, zoos in North America may choose to pursue accreditation by the Association of Zoos and Aquariums (AZA). To achieve accreditation, a zoo must pass an application and inspection process and meet or exceed the AZA’s standards for animal health and welfare, fundraising, zoo staffing, and involvement in global conservation efforts. Inspection is performed by three experts (typically one veterinarian, one expert in animal care, and one expert in zoo management and operations) and then reviewed by a panel of twelve experts before accreditation is awarded. This accreditation process is repeated once every five years. The AZA estimates that there are approximately 2,400 animal exhibits operating under USDA license as of February 2007; fewer than 10% are accredited.

In April 1999, the European Union introduced a directive to strengthen the conservation role of zoos, making it a statutory requirement that they participate in conservation and education, and requiring all member states to set up systems for their licensing and inspection. Zoos are regulated in the United Kingdom by the Zoo Licensing Act of 1981, which came into force in 1984. The act requires that all zoos be inspected and licensed, and that animals kept in enclosures are provided with a suitable environment in which they can express normal behavior.

As per section 38(H) of the Wild Life (Protection) Act, 1972, no zoo shall operate without being recognised by the Central Zoo Authority (CZA), New Dehli, which regulates zoos in India.

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