Building in Reservoirs

by C. Edward Scheader, Deputy Director; Bureau of Water Supply and Wastewater Collection, New York, NY,
James Anderson, Vice Pres.; Metcalf & Eddy, New York, NY,
B. Walter Sinnott, Sr. Vice Pres.; Hazen & Sawyer, P.C., New York, NY,

Serial Information: Civil Engineering—ASCE, 1989, Vol. 59, Issue 1, Pg. 50-53

Document Type: Feature article


The Croton Supply System, one of the three major water supply systems for New York City, is undergoing extensive rehabilitation. In an innovative use of space, some of the new construction is taking place inside the two main reservoirs. In New Croton Lake Reservoir, a new gate house is being built behind a massive cofferdam, but eventually it will be submerged like the renovated Old Gate House, which is 100 years old and still in service. The cofferdam is nine individual steel sheet cells filled with granular material. Following dewatering, excavation and blasting prepared the site for the New Gate House, which is reinforced concrete. In Jerome Park Reservoir, located in The Bronx, a well is being constructed to separate the raw water delivered through the Croton System from water which will be treated in a new plant on the site. The reservoir had to be drained in order to construct the wall, which is about 30 ft high and 1,500 ft long. In section, the wall is U-shaped and the cavity filled with granular material. It will be completed in 1990.

Subject Headings: Reservoirs | Granular materials | Residential buildings | Water supply systems | Walls | Reinforced concrete | Cofferdams

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