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Liberty Park at the World Trade Center

New York City, New York

Stormwater Detention


Port Authority of New York and New Jersey


Port Authority of New York and New Jersey


Oliveira Contracting Inc


April 2015

Technical Description:

  • DuroMaxx® detention system with 2,500 CF of storage

Liberty Park is an elevated public park  in the new World Trade Center in New York City. The park has a capacity of 750 people and sits 25 feet above Liberty Street overlooking the National September 11 Memorial & Museum. The park features a 20 foot high “living wall” and the St. Nicholas Church, destroyed in the September 11 attacks, will be rebuilt in the park.

A stormwater detention system was needed to meet NYC Department of Environmental Protection stormwater regulations. These regulations call for the reduction of the quantity of stormwater runoff leaving a site by temporarily storing the runoff that exceeds the site’s allowable discharge rate, and releasing it slowly over time.

Since the park will sit on the roof of the Vehicular Security Center, it is imperative the detention system is watertight. Contech consulted with engineers at the Port Authority of New York & New Jersey who specified a stormwater detention system made from 197 linear feet of DuroMaxx® Steel Reinforced Polyethylene (SRPE) that will provide approximately 2,500 cubic feet of stormwater storage. DuroMaxx achieves a level of watertight joint performance that sets it apart from conventional pipe products. Contech also consulted with the contractor, Oliveira Contracting Inc. to construct a custom hold down system to prevent the tanks from floating while being backfilled with cellular concrete.

The system was installed in just five hours using boom truck for picking up and placing the DuroMaxx pipes in place.

Technical Description:

  • DuroMaxx® detention system with 2,500 CF of storage

800-338-1122 |


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