1.3.1 Existing Stormwater Facility Design Guidance

Design guidance for sizing of flow control and treatment facilities is found in the 2004 SWMMEW or one of the following approved functionally equivalent manuals:
  • Spokane Regional Stormwater Manual (2008).
  • Yakima County Regional Stormwater Manual (2010).
  • WSDOT Highway Runoff Manual (Approved for use for WSDOT projects and by local governments for public road projects) (2011).

Each of these Manuals describe the preferred stormwater management practice in eastern Washington as infiltration, which is ideally suited for LID implementation. This Manual is intended to be used in conjunction with these or other existing design guidance manuals that apply to the project.

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