Each day 1.4 billion gallons (5.3 billion liters) of water flow
into New York City from a series of reservoirs to the north. Thirsty
New Yorkers have been rightfully proud of the clarity and fine taste
of the water from the Catskill, Delaware, and Croton systems. New York
is lucky; this complex water system runs on gravity, except for
buildings six stories or higher.