The new siphon will ensure a backup water supply to Staten Island and will facilitate the City's ability to benefit from anticipated increases in cargo volumes in the Port of New York and New Jersey.
The Anchorage Channel, an integral part of the shipping trade with access to New York Harbor and the rest of the Port of New York and New Jersey, is one of the more heavily used water transportation arteries in the world. Future cargo volumes are expected to double over the next decade and possibly quadruple in 40 years. The channel must be deepened in order to accommodate the new generation of cargo mega-ships, which have drafts that exceed 45 feet - the present depth of Anchorage Channel - in order to strengthen the City's ability to benefit from the anticipated increase in this economic sector.
Using funding authorized by the federal government, the Port Authority of New York New Jersey (PANYNJ), and the United States Army Corps of Engineers (USACOE), dredging operations are proceeding to deepen the Anchorage Channel to 50 feet below mean low water over a length of 19,000 feet, from the Verrazano-Narrows bridge to the channel's confluence with the Port Jersey Channel.
In order for PANYNJ and USACOE to complete their project, two water siphons (identified as Siphon #1 and Siphon #2) that are owned, operated, and maintained by the New York City Department of Environmental Protection, must be removed. These siphons are critical to ensuring a backup water supply to Staten Island and will be replaced by one new siphon at a deeper level. The proposed new siphon will be an approximately 6-foot diameter siphon-welded steel water transmission main within a 12-foot diameter tunnel constructed beneath the New York Harbor between Brooklyn and Staten Island within a tunnel. Additional construction may include tunnel launching and receiving shafts, extensive land piping and sewer replacement and relocation, two micro-tunnel crossings beneath the Staten Island railroad, and a new chlorination station.
On behalf of the Department of Environmental Protection, NYCEDC will manage the implementation of the project through the construction phase.