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Looking Up: Rooftop Water Towers

AUGUST 14, 2008

From your rooftop to your bathtub, water towers are an historic city icon with a job to do
Though rarely mentioned, rooftop water towers are icons of New York City architecture. No classic comic book city skyline would be complete without them. Though their design has changed little in over a century, they're as useful as they ever were.

In the 1800s, the city required that all buildings higher than six stories be equipped with a rooftop water tower to prevent the need for excessively high pressure on lower floors. Instead, a pump is used to fill the rooftop tanks, after which gravity kicks in. One of the advantages of a water tower is that pumps can be sized for average rather than peak demand, saving both water and money.

Only two companies build water towers in New York–Isseks Brothers and the Rosenwach Tank Company—and both family businesses have been in operation for well over a century. In formerly industrial TriBeCa, water towers have gone beyond the merely functional. A set of voluntary design guidelines calls for them to be built on new buildings ''if they are of the traditional wood barrel type.''

To celebrate the water tower's lofty shadow, British artist Rachel Whiteread created "WaterTower," a 12-foot high, translucent resin cast of a SoHo rooftop water tower in 1998 as part of a grant for New York City's Public Art Fund.