Location: Philadelphia, Pennsylvania
Size: 67 “Greened Acres”
Owner: Resource Environmental Solutions LLC
Manager: Resource Environmental Solutions LLC
Designers: SAS Geospatial Inc. & Pennoni Associates Inc.
Contractors: Brightfields Inc. & American Sitework LLC
Manufacturer: StormTrap | AC Miller | Concrete Products Inc
To help Philadelphia meet its Clean Water Act goals and the goals of the Green City - Clean Waters Program started by the Philadelphia Water Department, the Darien Crossing Stormwater Retrofit project involved installing a 1.8 million-gallon underground storm water management practice.
Through a PWD Greened Acre Retrofit Program grant, RES designed and constructed the practice within the Sports Stadium District of the city, which is known as Darien Crossing. Along with the underground system, the project also consisted of demolishing a vacant portion of an existing warehouse and constructing a new parking lot with green vegetation and infrastructure, such as trees, grasses and bioswales.
The existing drainage network was retrofitted with four large bioswales to serve as pretreatment for rainwater, which is then stored in the basin and released into the city’s combined sewer overflow system. An early challenge was sourcing an underground detention system that could withstand large weight on top of it, then because of the small footprint of the former warehouse, which was 4.3 acres, the installation of the system was done in three phases. During each phase, 450 chambers of the system were installed. The detention system provides 251,653 cubic feet of storm water storage. In its entirety, the new system brings 67 greened acres to the site.
As of completion, the site is fully operational and serves as a parking lot for sports fans as the site is near the Lincoln Financial Field and Citizens Bank Park.