A new wooden water tank went up last week atop 202 West 40th Street in Manhattan, through the efforts of the Rosenwach Tank Company of Long Island City, Queens. Every building at least 80 feet tall in New York City must have a water reservoir to meet the fire codes, and water tanks are also used to provide water service.
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In the 1800s, New York City required that all buildings higher than 6 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 1800s.
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The Rosenwach Tank Company is one of a very few rooftop-tank coopers left in the city. No one has ever come up with a better way of making a rooftop water tank than by girdling a cylinder of wooden staves with metal hoops and adding a conical roof, and New York, which has thousands of cylindrical wooden rooftop water tanks with conical roofs, couldn’t exist without them.
The tanks are here because the water that comes into town through the aqueducts will rise to about the sixth floor without any assistance but has to be pumped to tanks on top of taller buildings to provide water pressure on their upper floors. This scheme provides plenty pressure, because the water arrives at those floors by falling straight down.
Rosenwach has built and installed well over half of the city’s tanks. Many of New York’s Rosenwach tanks were constructed in twenties, under the regime of Julius Rosenwach, the father of Wallace Rosenwach who is the current president. Julius Rosenwach moved the business to Greenpoint (Williamsburg, Brooklyn) from Grand street, Manhattan, fifty-four years ago.
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