The documents listed below compose the entire Snohomish County Drainage Manual. The drainage manual is used in concert with Snohomish County code and Snohomish County engineering design and development standards (EDDS).
The county has revised its stormwater management codes (primarily Chapter 30.63A SCC - Drainage and Chapter 30.63B SCC – Land Disturbing Activity) to comply with federal and state law..
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View past editions of the Drainage Manual.