Water Tower - Water Towers Around The World

Water Towers Around The World

Water towers are ubiquitous in the New York City skyline, United States.

In the 19th century, New York City required that all buildings higher than six stories be equipped with a rooftop water tower. This was necessary to prevent the need for excessively high pressures at lower elevations, which could burst pipes. In modern times, the towers have become fashionable in some circles. As of 2006, the neighborhood of Tribeca requires water towers on all buildings, whether or not they are being used. Two companies in New York build water towers, both of which are family businesses in operation since the 19th century.

The original water tower builders were barrel makers who expanded their craft to meet a modern need as buildings in the city grew taller in height. Even today, no sealant is used to hold the water in. The wooden walls of the Water Tower are held together with cables but leak through the gaps when first filled. As the water saturates the wood it swells, the gaps close and become impermeable.

The rooftop water towers store 25,000 litres (5,500 imp gal) to 50,000 litres (11,000 imp gal) of water until it is needed in the building below. The upper portion of water is skimmed off the top for everyday use while the water in the bottom of the tower is held in reserve to fight fire. When the water drops below a certain level, a pressure switch, level switch or float valve will activate a pump or open a public water line to refill the water tower.

Architects and builders have taken varied approaches to incorporating water towers into the design of their buildings. On many large commercial buildings, water towers are completely hidden behind an extension of the facade of the building. For cosmetic reasons, apartment buildings often enclose their tanks in rooftop structures, either simple unadorned rooftop boxes, or ornately decorated structures intended to enhance the visual appeal of the building. Many buildings, however, leave their water towers in plain view atop utilitarian framework structures.

Water towers are very common in India, where the electricity supply is erratic in most places.

In many countries, water towers have been taken out of the water supply system and replaced by pumps alone.However, this approach is dependent on continuous pumping; if the pumps fail (such as during a power outage), then water pressure will be lost, causing potential public health concerns. Many states require a "boil water" notice to be issued if water pressure drops below 20 psi.

Water towers are often regarded as monuments of civil engineering. Some are converted to serve modern purposes, as for example, the Wieża Ciśnień in Wrocław, Poland which is today a restaurant complex. Others have been converted to residential use.

Historically, railroads that used steam locomotives required a means of replenishing the locomotive's tenders. Water towers were common along the railroad. The tenders were usually replenished by water cranes, which were fed by a water tower.

Some water towers are also used as observation towers, and some restaurants, such as the Goldbergturm in Sindelfingen, Germany, or the second of the three Kuwait Towers, in the City-State of Kuwait. It is also common to use water towers as the location of transmission mechanisms in the UHF range with small power, for instance for closed rural broadcasting service, portable radio, or cellular telephone service. In hilly regions, local topography can be substituted for structures to elevate the tanks. These tanks are often nothing more than concrete cisterns terraced into the sides of local hills or mountains, but function identically to the traditional water tower. The tops of these tanks can be landscaped or used as park space, if desired.