NYC Water Towers
First here is some history on water towers.
https://www.6sqft.com/nyc-water-towers-history-use-and-infrastructure/
For over 100 years, water towers have been a seamless part of New York City’s skyline. So seamless, in fact, they often go unnoticed, usually overshadowed by their glassy supertall neighbors. While these wooden relics look like a thing of the past, the same type of water pumping structure continues to be built today, originating from just three family-run companies, two of which have been operating for nearly this entire century-long history. With up to 17,000 water tanks scattered throughout NYC, 6sqft decided to explore these icons, from their history and construction to modern projects that are bringing the structures into the mainstream.
Water tank fundamentals
When the Dutch settled New York City they found an island rich with waterways and natural streams. However, as the city’s industrial sector grew, so did its polluted waters. With no proper drainage system, standing pools of grime would form in the streets. The harm of these unsanitary conditions was not revealed until a group of wealthy New Yorkers formed the Citizens Association of New York to focus on public health reform. After the group’s survey revealed dangerously unhygienic conditions, a campaign was launched to improve the quality of water and people’s access to it.
The Department of Public Works was later founded in 1870 to improve the drainage system and access to water. During the 1880s, indoor plumbing began replacing well-drawn water, and roughly 50 years later, top-floor storage tanks started popping up all over the city. Tanks were placed on rooftops because the local water pressure was too weak to raise water to upper levels. When construction started to grow taller, the city required that buildings with six or more stories be equipped with a rooftop tank with a pump.
About 5,000 to 10,000 gallons of water can be stored in the tanks. The upper layer of water is used for everyday use, with water at the bottom reserved for emergencies. When the water drops below a certain level, an electric pump is triggered and the tank refills. Gravity sends water to pipes throughout the building from the roof. A water tank usually lasts roughly 30-35 years. It can be built within 24 hours and takes just two or three hours to fill with water.