Kent Surface Water Design Manual

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The Kent Surface Water Design Manual (KSWDM) adopts the 2021 King County Surface Water Design Manual (KCSWDM) and applies to development proposals within the City of Kent. It includes all changes and deletions to the KCSWDM adopted by the City of Kent. It's to be used for guidance in drainage review and design of stormwater facilities within the City of Kent.

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Surface Water Design Manual

The Western Washington Phase II Municipal Stormwater General Permit requires the City of Kent to hold all development projects vested prior to January 1, 2017 to the newly adopted stormwater rules and regulations outlined in the current City of Kent Surface Water Design Manual if they have not started construction by July 21, 2022.

For the purposes of this requirement, “started construction” means that site work directly related to project approval has begun. Simply clearing the site does not constitute the start of construction but clearing and grading to final grade or installing utilities on site would.

If your project has not started construction by July 21, 2022, you will need to update your technical information report (TIR) to thoroughly show compliance with the current City of Kent Surface Water Design Manual. This updated TIR must be submitted to the City of Kent for approval, or you will not be allowed to start construction after July 21, 2022.

Thank you for understanding and for complying with this State and City requirement. If you have further questions, please contact the Development Review division of the City of Kent Economic and Community Development Department.

Archive: Previous Versions of the City of Kent Surface Water Design Manual

2017

The 2017 Kent Surface Water Design Manual (KSWDM) adopts the 2016 King County Surface Water design manual (KCSWDM) and applies to development proposals within the City of Kent. It includes all changes and deletions to the KCSWDM adopted by the City of Kent and is to be used for guidance in drainage review and design of stormwater facilities within the City.

2002

The 2002 Kent Surface Water Design Manual (KSWDM) adopts the 1998 King County Surface Water design manual (KCSWDM) and applies to development proposals within the City of Kent. It includes all changes and deletions to the KCSWDM adopted by the City of Kent and is to be used for guidance in drainage review and design of stormwater facilities within the City.

In addition to the 2002 KSWDM, the City has adopted blanket adjustments to address specific elements within the KSWDM and changing regulations at the state level.

Chapter 5 of the 2009 City of Kent Design and Construction Standards (KDCS) references the 2002 KSWDM for the design of stormwater facilities.  Chapter 5 of the KDCS also includes requirements for easements and construction standards of stormwater systems in the City of Kent, including standard details for storm structures, appurtenances and erosion control.

Designers of storm water facilities located in the City of Kent should reference all of the above documents.