Specifications
The 163-mile (262 km) aqueduct consists of 55 miles (89 km) of cut and cover aqueduct, over 28 miles (45 km) of grade tunnel, 35 miles (56 km) of pressure tunnel, six miles (10 km) of steel siphon, and 39 miles (63 km) of conduit. The 67 shafts sunk for various purposes vary in depth from 174 to 1,187 feet (362 m). Water flows by gravity through the aqueduct at a rate of about 4 feet per second (1.2 m/s).
The Catskill Aqueduct has an operational capacity of about 550 million US gallons (2,100,000 m3) per day north of the Kensico Reservoir in Valhalla, New York. Capacity in the section of the aqueduct south of Kensico Reservoir to the Hillview Reservoir in Yonkers, New York is 880 million US gallons (3,300,000 m3) per day. The aqueduct normally operates well below capacity with daily averages around 350–400 million US gallons (1,500,000 m3) of water per day. About 40% of New York City's water supply flows through the Catskill Aqueduct.
Read more about this topic: Catskill Aqueduct