Surface Water Design Standards
Surface Water Design Manual
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. To comply with this requirement, the City adopted the 2016 King County Surface Water Design Manual with Amendments. The 2016 King County Surface Water Design Manual has been approved by the Department of Ecology as an equivalent Manual.
2016 King County Surface Water Design Manual (KCSWDM) as amended by the City is
only applicable to projects vested with a complete application after January 1,
2016 Surface Water Design Manual
The entire Surface Water Design Manual 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.
2016 Surface Water Design Manual documents
Combined SWDM including all chapters, appendices, definitions, and reference sections (27.48 MB)
Chapter 1-Drainage Review and Requirements
Chapter 2- Drainage Plan Submittal
Chapter 3-Hydrologic Analysis and Design
Chapter 4-Conveyance System Analysis and Design
Chapter 5-Flow Control Design
Chapter 6-Water Quality Design
Appendix A-Maintenance Requirements for Flow Control, Conveyance, and Water Quality Facilities
Appendix B-Master Drainage Plan Objective, Criteria, Components, and Review Process
Appendix C-Simplified Drainage Review Requirements
Appendix D-Construction Stormwater Pollution Prevention Standards
Combined References, Forms and Worksheets
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, and revised flow on-site BMP credits.
Updates and Public Involvement
The City's Planning and Development Committee recommended adoption of the 2016 KCSWDM with the City of Renton Amendments.
City Council Meetings
Monday, December 5, 2016 - Public Hearing and First Reading of Ordinance
Monday, December 12, 2016 - Second Reading of Ordinance and Council Adoption
Ordinance 5828 (87.8 MB)
City of Renton Surface Water Design Standards effective February 10, 2010.
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,
City of Renton Amendments to the 2009 King County Surface Water Design Manual
For additional information, please contact: Hebé Bernardo, Surface Water Utility Engineer, at 425.430.7264.