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Investing in Our Water

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The Croton Water Filtration Plant Project

The Croton System is the oldest of City’s three systems (Croton, Catskill and Delaware) that provide drinking water to the City and upstate communities. Although it was once the only reservoir system supplying water from outside the City, the Croton System is now the smallest of the three systems. The Croton watershed is a series of interconnected reservoirs and lakes in northern Westchester and Putnam Counties. The Jerome Park Reservoir, a distribution reservoir, is located at the downstream end of the Croton System and is the point at which Croton water enters City’s water distribution system. The Croton System provides an average of approximately 10 percent of the City’s average daily demand. During droughts, the Croton System provides up to 30 percent of in-City consumption.

Croton water is primarily used in low-lying areas of the Bronx and Manhattan, where the water can be conveyed by gravity. Two pump stations, the Jerome Avenue Pump Station and the Mosholu Pump Station, can supply additional Croton water to the Intermediate and High Level service areas, normally served by the Catskill and Delaware Systems.

This project provides filtration and disinfection of the Croton System to: 1) allow DEP to continue to provide drinking water of the highest quality; 2) prevent the periodic shutdown of the Croton System, particularly at times of the year when the City water demand is at its highest; 3) meet the requirements of existing and future regulations; 4) augment the effective yield and operational flexibility of the City’s overall water supply system, and 5) provide additional protection from contamination of the treated water in the water conveyances by pressurizing the treated water conveyances.

Construction work at the Croton Water Filtration Plant site continues to make progress: excavation of the two treated water tunnels has been completed and installation of piping in these tunnels continues; placement of concrete for lining the raw water tunnel has been completed; and concrete placement, installation of mechanical, electrical, heating and ventilating, and plumbing work continues to advance. In addition, work off-site at the treated water shafts at the Jerome Park Reservoir is ongoing.

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City Water Tunnel No.3

The largest capital project ever undertaken in New York City — the construction of City Water Tunnel No. 3 — has been going on almost invisibly, hundreds of feet beneath the streets for decades. . This project represents one of the most significant investments in the future of the City’s drinking water system

The approximately $680 million contract employed more than 350 workers at its peak. The next and last phase of tunnel work in Manhattan includes the installation of piping, mechanical and electrical equipment in the tunnel shafts and distribution chambers. The cost of the upcoming work is $176 million. The Manhattan section of the tunnel is scheduled to be activated in 2013. The total City Water Tunnel No. 3 project costs $6 billion.

Construction of City Water Tunnel No. 3 began in 1970. The tunnel will enhance and improve the City’s water delivery system, and allow for the inspection and repair of City Tunnels No. 1 and 2 for the first time since they were put into service, in 1917 and 1936, respectively. Tunnel depth ranges from 400 to 800 feet below ground, and the finished diameters of the tunnel will range from 10 feet to 24 feet. The amount of rock excavated during the first two stages of the project is approximately 82,000,000 cubic feet, or enough to fill both the Empire State Building and the new Yankee Stadium. The amount of concrete placed — approximately 30,000,000 cubic feet — can fill 80 percent of the Empire State Building.

Staten Island Siphon Project

The Staten Island Siphon Replacement is part of a larger project that is intended to dredge and deepen the Anchorage Channel, which runs between Staten Island and Brooklyn, to allow larger ships into New York Harbor.

Staten Island uses approximately 50 million gallons of drinking water per day. There are two tunnels run between Staten Island and Brooklyn that act as a back-up water supply to Staten Island’s residents. They are currently at depths of 56 and 60 feet below the harbor. The new siphon will be at a depth of 100 feet, which will enable the deepening of the Anchorage Channel to allow for increased cargo volumes in future years.

The cost of this project is being split by the Port Authority and the Department of Environmental Protection, with each agency contributing $125 million toward ensuring that future generations of Staten Islanders will have access to New York City’s world class water. To connect the new siphon to the local water distribution network, the project will install 6,545 feet of new water mains in Staten Island, and 1,710 feet of new water mains in Brooklyn.

Not only will the new siphon be deeper in the earth than the existing siphons, it will be bigger. With a diameter of 72”, this siphon will provide five million gallons of daily water supply under normal conditions, and up to 150 million gallons per day in emergency situations, ensuring a reliable supply of water for the nearly 500,000 residents of Staten Island.

Shafts have been constructed in Staten Island and Brooklyn that will allow tunnel boring machines to begin drilling underground so that the new siphon can be installed. The tunnel boring is scheduled to be completed in 2013, with the full project being completed in 2014.

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