Surface Water Design Standards

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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.

2017 City of Renton Surface Water Design Manual

The entire 2017 City of Renton Surface Water Design Manual (dated December 12, 2016) including Chapters 1-6, Appendices A through D, Definitions, and Reference sections is available for download in Adobe Acrobat PDF format. The electronic version of the manual is searchable and the bookmarks function within the navigation pane allows for quickly moving through document.

Educational Materials

Renton's New Surface Water Design Standards - FAQs
King County Stormwater Pollution Prevention Manual - Best Management Practices for Commercial, Multi-Family and Residential Properties, dated April 2016. Note: This manual replaces the King County Stormwater Pollution Prevention Manual, Best Management Practices for Businesses, dated January 2009.

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

Ordinance 5828
Covenants
On-Site Management Practices Standard Details, see Surface Water Standard Details 226 - 265.20

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.

CITY OF RENTON WASHINGTON