Thank you for allowing me to answer your interesting question. The
filling of water towers in New York City is a simple process really.
During off-peak hours water is pumped into the towers? holding tanks
using electrical pumps:
?Each tank is custom-built for the building it serves and is designed
to hold an adequate capacity of water for the day. At night, more
water is pumped into the tower to be used the next day?This system
relies almost exclusively on gravity to deliver water2. Since it
doesn't use many moving parts, this design has aged extremely well3,
but the designers didn't envision there would be many tall buildings
in New York. Unfortunately, any building over six storeys needs a
water tower to ensure adequate water pressure to every floor. By
placing the water supply for the building on the roof, buildings are
able to use gravity to increase their water pressure.?
?The Water Towers of New York City, USA?
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Tutuzdad-ga ? Google Answers Researcher
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