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Reducing Pollutant Loads from Philadelphia's Combined Sewer System with Green Stormwater Infrastructure

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The Philadelphia Water Department (PWD) has selected green stormwater infrastructure (GSI) as one of the primary combined sewer overflow (CSO) control techniques to comply with the U.S. Environmental Protection Agency's (EPA) National CSO Policy. The EPA's CSO Policy allows compliance in cases where certain criteria are met with a presumptive approach for CSO control that requires a minimum of 85 percent capture of pollutant loads on an annual basis. For many CSO cities, such as Philadelphia, GSI is considered an effective CSO control technique. It provides additional benefits to a community, while effectively removing stormwater volumes and pollutant loads at levels achieved by alternative treatment options and to meet the 85 percent capture required under EPA's presumptive approach for CSO control. The U.S. EPA's Storm Water Management Model (SWMM) was selected to develop wet weather flow volumes to compare GSI pollutant removal to that of primary clarifiers.

Document Type: Research Article


Publication date: January 1, 2012

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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