Manayunk Sewer Basin Project: Innovative Green Design Client: Philadelphia Water Department Location: Philadelphia, PA As part of its long term control plan, the Philadelphia Water Department (PWD) retained Hazen and Sawyer to design a 3.75-million gallon combined sewer overow (CSO) detention facility on Venice Island in the Manayunk section of the city – a compact site between the Schuylkill River and an active railroad and the historic Manayunk Canal and in the vicinity of parkland, a recreational facility, and business district – a sensitive area requiring careful consideration of neighborhood impacts. Project Outcomes and Benefits The CSO detention basin was constructed underground, with public parking and facilities redesigned and restored atop the basin. The facility will eliminate

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