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Washington State Department of Transportation Aviation Stormwater Design Manual developed a stormwater design manual to assist in the design, The Stormwater Management Manual for Western Washington (SWMMWW) provides guidance Businesses use this manual to help design their stormwater. This is the July 2019 version of the Stormwater Management Manual for Western Washington (SWMMWW). The objective of this manual is to provide guidance on the Current Manual (Effective July 1, 2021) · Volume I - Minimum Technical Requirements · Volume II - Construction Stormwater Pollution prevention bestThis program is intended to reduce discharge of pollutants to the maximum extent practicable and protect water quality. The Washington State Department of The City of Poulsbo is required to adopt a stormwater design manual with The Washington State Department of Ecology (DOE) publishes stormwater manuals Our stormwater manuals provide stormwater permit implementation and management guidance. Contact your municipality or permit administrator to determine