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The 2019 Stormwater Management Manual for Western Washington (SWMMWW) published by. Department of Ecology, and as amended in 2014. B. Low Impact Development: The City of Lake Stevens uses the 2014 updated version of the 2012 Stormwater Management Manual for Western Washington. Click the image to the left to go toDefine Stormwater Management Manual for Western Washington. means the 5-volume technical manual (Publication Nos. 05-10-029 through 05-10-033) published by The objective of this manual is to provide guidance on the measures necessary to control the quantity and quality of stormwater produced by new development and COA Supplemental Manual to the Ecology Stormwater Management Manual for Western Washington. Volume I - Minimum Technical Requirements and Site Planning. Our stormwater manuals provide stormwater permit implementation and management guidance. Contact your municipality or permit administrator to determine The Stormwater Management Manual for Western Washington (SWMMWW) provides guidance on the measures necessary to control the quantity and quality of The Stormwater Management Manual for Western Washington (SWMMWW) provides guidance on the measures necessary to control the quantity and quality of