The intent of the stormwater management system was to reduce and/or regulate the stormwater runoff through a slow release detention system and manage the first 1.5” of rainfall at a maximum release rate of 0.05 cfs/IA acre.
The design solution involved construction of an underground stormwater retention facility to be placed beneath the existing asphalt parking lot of the facility. The underground basin utilized precast Terre Box Stormwater system having three (3) rows at 266’+/- and (4) rows at 189’+/- for a total storage volume of 123,796cf and 266 pieces.
CEG prepared an Existing Resource and Site Analysis (ERSA) Application and obtained permit approvals from the Philadelphia Water Department (PWD) for the installation of a precast Terre Box Stormwater system located below ground at the vacant warehouse facility. The underground storage system was designed to capture and slow release the 1 ½” storm event at a maximum release rate of 0.05 cfs/IA acre and qualified for PWD stormwater retrofit credits.