Act 167 Stormwater Management Plans

A lot of water had passed under the bridges since the passing of Stormwater Management Act 167 in1978.  The Act requires counties to adopt watershed-based plans that address the impacts of accelerated stormwater runoff.

Two new Act 167 stormwater management plans recently came on line in our Watershed Alliance of SE Pennsylvania region.  The Pennypack Watershed plan prepared by Temple University’s Center for Sustainable Communities was approved by the Pennsylvania Department of Environmental Protection (DEP) on July 22, 2013.  The Poquessing Watershed Plan prepared by NTM Engineering, Inc. was approved by DEP on August 28, 2013.  Both plans were vetted by watershed municipalities and stakeholders via the Regional Watershed Partnerships.

The approval of these plans triggers a 6-month deadline for watershed municipalities to update and/or adopt stormwater ordinances consistent with the Act 167 model ordinance.

The plans also identify stormwater problem areas and recommend site specific stormwater improvements such as locations for basin retrofits, infiltration trenches, or regional stormwater management facilities.

The plans also include stormwater modeling that establishes peak rate control management districts for each watershed, and assesses the impact of future land development trends on peak discharge and run-off volumes.

Act 167 stormwater plans were prepared for the Darby-Cobbs and Tookany/Tacony-Frankford Watersheds in 2005 and 2008, respectively.  A Wissahickon Watershed stormwater plan is in the works for a 2014 submittal to PA DEP.

Copies of Act 167 Stormwater Management plans are available on the Philadelphia Water Department’s web site (Look under “Your Watershed”, Ex. “Darby-Cobbs”, and then “Key Documents/Maps” to access the plans.)


  • preserve and restore the flood carrying capacity of watershed streams
  • reduce erosion and sedimentation;
  • preserve natural stormwater runoff regimes and the natural course, current and cross sections of streams; and
  • protect and conserve ground water and ground water recharge areas


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