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The Replacement of the Existing Water Siphons Between Brooklyn and Staten Island

The New York City Department of Environmental Protection (NYCDEP or Department) proposes to construct a water siphon that would replace the two existing, subaqueous water siphons located beneath Upper New York Bay between Bay Ridge, Brooklyn and Stapleton and Tompkinsville, Staten Island.

New York City currently maintains two existing siphons, which provide secondary/back up water supply for City Tunnel No. 2, the main water supply for Staten Island, across the Anchorage Channel within the Upper New York Bay from Brooklyn.  The U.S. Army Corps of Engineers (USACE)/Port Authority of New York & New Jersey (PANYNJ), as part of their New York and New Jersey Harbor Deepening Project, will dredge the this channel to a depth of approximately 54 feet below mean low water (MLW). The existing siphons are situated at a depth that could be compromised by the dredging in the channel.

The proposed 72-inch siphon would replace the two existing siphons in order to provide the necessary backup water supply from Brooklyn to Staten Island. The proposed siphon would provide 5 million gallons per day (mgd) of daily water supply to Staten Island under normal conditions. In emergency situations, the new siphon could supply on average 50 mgd, with a peak flow of 150 mgd, thus ensuring a redundant and reliable supply of water to Staten Island.

The proposed project would involve the construction of shafts on both the Brooklyn and Staten Island sides of the harbor, water transmission mains and other related infrastructure improvements to provide for connection to the existing water supply systems already in place and a chlorine station adjacent to the Staten Island shaft.

If you have any questions regarding the environmental review please contact Sangamithra Iyer at the below address.
Sangamithra Iyer, P.E.
Project Manager, Water Supply Infrastructure and Watershed Assessment
New York City Department of Environmental Protection
Bureau of Environmental Planning and Analysis
59-17 Junction Blvd, 11th Floor
Flushing, New York 11373

Environmental Assessment Statement (PDF)
EAS Supplemental Report (PDF) (82.8 MB)
Negative Declaration (PDF)

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