The $US15.6 million reconstruction strengthens the reliability of the water supply network in Manhattan by restoring infrastructure that previously required frequent repairs. Trenchless Technology was used as part of the project to line more than 10,000 feet of water main.

The cast iron water main was upgraded along Madison Avenue, pulling segments of pipe lining through its existing 48 inch diameter. After the pipe lining was inserted, the main was pressurised with water causing the lining to fit tightly against the cast iron main.

The reconstruction was funded by the Department of Environmental Protection and managed by the Department of Design and Construction (DDC) and included installation of hydrants, new sidewalks and curbs.

Deputy Commissioner Eric C. Macfarlane said “Excavation of streets is never welcomed in a neighbourhood and we wanted to minimise the impact along the city’s central business district to the largest extent possible.

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“I am proud of the way DDC’s project engineers investigated the feasibility of relining this critical water supply infrastructure and designed a rehabilitation method for this pipeline using Trenchless Technology.”