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South Kensington

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Cohocksink/Northern Liberties Storm Flood Relief: Big Investments to Help Our Neighborhoods

For our final Infrastructure Week post, we are looking at a massive, multi-year project that will help reduce flooding related to heavy rains in several neighborhoods. Like many other cities, Philadelphia is dealing with a sewer system designed for a time when there were far fewer hard surfaces like streets, parking lots and buildings.

Because those surfaces don’t absorb rain, the water becomes stormwater runoff, which can overwhelm sewers, leading to localized flooding and combined sewer overflows. While the City is relying on Green Stormwater Infrastructure investments made through the Green City, Clean Waters program to deal with this challenge, those green tools are more effective when we also improve our traditional sewer system.

A good example of an investment in our existing system that will enhance Green City, Clean Waters projects is the Cohocksink Storm Flood Relief project, also called the Northern Liberties SFR. The project is named after the Cohocksink Creek, which once flowed through Kensington and Northern Liberties and emptied into the Delaware River not far from where SugarHouse Casino stands today.

Like many small streams in Philadelphia, the Cohocksink was covered over and integrated into the sewer system in the mid to late 1800s.
Today, the Cohocksink sewer system must manage stormwater drainage from more than 1,000 acres of urban land. 

To get the inside scoop on the Cohocksink improvements, we put a few questions to project manager Bill Dobbins, an engineer who has worked with Philadelphia Water since 2001.

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