Surface Water Design Standards

Per the City of Renton's National Pollutant Discharge Elimination System (NPDES) permit, it is required to adopt updated surface water design standards that are equivalent to portions of Volume 1 of the 2012 Stormwater Management Manual for Western Washington, as amended in 2014, by December 31, 2016.

The 2016 King County Surface Water Design Manual has been approved by the Department of Ecology as an equivalent manual.  To comply with the City of Renton's NPDES permit requirement, the city adopted the 2016 King County Surface Water Design Manual with Amendments to create the 2017 City of Renton Surface Water Design Manual.

The 2017 City of Renton Surface Water Design Manual is only applicable to projects vested with a complete application after January 1, 2017.

Educational Materials

Key Changes

Some of the major changes in the 2016 KCSWDM from the currently adopted 2009 KCSWDM include (but are not limited to):

  • Low Impact Development (LID) techniques for all new and/or replaced impervious surfaces
  • new type of drainage review,
  • updated methods for sizing water quality facilities
  • revised flow on-site BMP credits.

Resources

Resources

Updates and Public Involvement

The City's Planning and Development Committee recommended adoption of the 2016 KCSWDM with the City of Renton Amendments.
The 2009 King County Surface Water Design Manual (KCSWDM) and City of Renton Amendments to the 2009 KCSWDM is only applicable to projects vested with a complete application prior to January 1, 2017.

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