New York Water Siphons

Location:New York, USA
Year:2011
Project Type:
Water Tunnel
Customer:OHL New York
Products:1x mobil california switch

5x mortar car 3,5/4m³
4x double segment car
12x mortarbox 8m³
1x tilting device
3x passenger car 14 men

The new, 72-inch siphon was excavated at a depth of 100 feet and will replace the two, nearly century old, existing water connections that run from Bay Ridge in Brooklyn to Stapleton and Tompkinsville on Staten Island. The new siphon serves as the back-up water feed for Staten Island and conveys approximately 5 million gallons of water each day. If needed, it has the capacity to carry up to 150 million gallons per day.

The Earth Pressure Balance TBM was used for the first time in New York City. It is made specifically for use in soft ground as opposed to bedrock, excavates and simultaneously installs four foot-wide concrete pre-cast segment rings to line the tunnel wall.