Cohocksink Storm Flood Relief Project: Phase 6

Current Phase:


Since 2004, the Northern Liberties, Ludlow, and South Kensington neighborhoods have been heavily impacted by an increasing number of intense rain events.

Phase 6 of the Cohocksink Storm Flood Relief Project is the final phase of a six-phase flood mitigation project (previously called the Northern Liberties Flood Relief Project).

The project proposes to double conveyance capacity of the combined sewer system through the construction of new sewer and stormwater infrastructure in these flood-prone commercial and residential neighborhoods.

This project includes the following characteristics:

  • Large-scale, comprehensive infrastructure that mitigates risk to at least four community lifelines (transportation, water, hazardous material, health and medical)
  • Reduced risk of sewer backup into more than 1,000 basements
  • Reduced combined sewer overflow, groundwater seepage, shallow street flooding, and building flooding across a 1,302-acre rapidly developing drainage area
  • Direct risk reduction and ancillary benefits to disadvantaged communities
  • Ancillary benefits, including rebuilt sidewalks, curbs, and streets restoration; new bike lane routes; and nature-based solution components like green streets infrastructure to reduce flood risk
  • Protection of critical facilities and community assets, including utility buildings, a school, a recreation center, and a medical facility.

Through 1,600 feet of new box sewers; utility, street, and sidewalk repair; and incorporation of nature based solutions, this project will reduce the risk of flooding while enhancing community amenities.

For more information, contact:
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