The aqueduct was constructed between 1939 and 1945, and carries approximately half of New York City's water supply of 1.3 billion US gallons (4,900,000 m3) per day. At 13.5 feet (4.1 m) wide and 85 miles (137 km) long, the Delaware Aqueduct is the world's longest tunnel.

The Delaware Aqueduct carries the water from the 95-square-mile (250 km2), 49.6-billion-US-gallon (188-million-cubic-metre) watershed Rondout Reservoir and the Cannonsville, Neversink, and Pepacton reservoirs via the Delaware and Neversink tunnels. (Since those three are in the Delaware River watershed, Rondout is considered by New York City's Department of Environmental Protection to be part of the Delaware system despite being firmly within the Hudson River watershed itself.)

Combined, the four reservoirs account for 1,012 square miles (2,620 km2) of watershed and 320.4 billion US gallons (1.2 billion cubic metres) of capacity, 890 million US gallons (3.4 million cubic metres) of which goes to the city daily — 50% of the entire system's. All this water is fed from the Rondout to West Branch Reservoir in Putnam County (part of the Croton River watershed, which includes the flow of the upstream Boyds Corner Reservoir), then to the Kensico, and Hillview reservoirs in southern Westchester County, before continuing on to distribution within New York City.

According to wikipedia

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