Repairs to New York's Delaware Aqueduct
Paul V. Rush, P.E. (NYC Environmental Protection Bureau of Water Supply)

The Delaware Aqueduct Bypass Tunnel is the largest repair project in the 177-year history of New York Cityes water supply system. Its centerpiece is a 2.5-mile-long bypass tunnel that DEP is building 600 ft under the Hudson River from Newburgh to Wappinger. When the project is finished in 2023, the bypass tunnel will be connected to structurally sound portions of the existing Delaware Aqueduct on either side of the Hudson River to convey water around a leaking section of the tunnel. The 85-mile-long Delaware Aqueduct, the longest tunnel in the world, typically conveys about half of New York Cityes drinking water each day from reservoirs in the Catskills.