Tunnels and Aqueducts

When rain lands in the Catskill Watershed, it filters down through mountain bedrock and flows into springs that feed creeks and streams and lakes. Nature moves the water into 18 reservoirs and three lakes in seven counties where it is contained. Underground waterways three primary aqueducts carry the water to two balancing reservoirs and four distributing reservoirs. Seven tunnels connect the various reservoirs and distributing points, moving the water to New York City where it is distributed through a network of 6,181 miles of water mains with 88,600 mainline valves to regulate flow.

Remarkably, the system is almost entirely gravity-fed with only five percent of the supply being pumped to its destination.

 
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