This manual covers the entire state and meets the level of stormwater management established by the Washington Department of Ecology (Ecology) in the Stormwater Management Manual for Western Washington (SMMWW) (August 2001), and the Stormwater Management Manual for Eastern Washington (SMMEW), which is in the process of being finalized Skagit County has adopted Ecology's 2019 Stormwater Management Manual for Western Washington. The manual, which is standardized across most Western Washington counties, consists of nine Minimum Requirements (MR). See the Stormwater Management Requirements handout for information on when these Minimum Requirements apply. MR1 Stormwater Site Plan Ecology Manual: Stormwater Management Manual for Western Washington, Washington State Department of Ecology. February, 2005. LID Manual: Low Impact Development - Technical Guidance Manual for Puget Sound, Puget Sound Action Team and Washington State University Pierce County Extension, January 2005 or current edition. The other guidance manuals referenced in BMP T7.30 are the . Low Impact Development Technical Guidance Manual for Puget Sound (Hinman 2012) and . Guidance Document Western Washington Low Impact Development (LID) Operation and Maintenance (O&M) (Hererra and WSC, 2013). Key Shared Design, Construction, and Maintenance Criteria . Design Criteria: 1. Western Washington (the 2019 Manual) Proposing amendments Section 12.02.030 of the Poulsbo Municipal Code The 2019 Manual builds on the work within the previous 2014 Manual with regards to Low Impact Development and LID as a preferred approach. Additionally, the 2019 Manual incorporated text revisions Ecology's Stormwater Manual for Western Washington (updated in 2012) includes low impact development (LID) related definitions, requirements, and an LID performance standard. See Stormwater Management and Design Manuals on Ecology's web page. See Stormwater Drainage and Water Quality on page 7 of this checklist for additional LID resources. Western Washington (Ecology Manual) • Western Washington Low Impact Development (LID) Operations and Maintenance (O&M) • LID Technical Guidance Manual for Puget Sound • WSDOT Highway Runoff Manual • Hydraulics Manual by WSDOT • Rain Garden Handbook for Western Stormwater Management Manual for Western Washington (SMMWW) describe those requirements. From the adoption of the first SMMWW back in 2001 and through its subsequent with the changes made to the stormwater manual such as adding capabilities that allow Low Impact Development (LID) modeling and design, and determining compliance with the LID • Option 2 -Use LID Performance Standard and BMP T5.13 •Bioretention sizing -Set ponding area ≥ 5% drainage area List #2 Lawn and landscaped areas •Post-Construction Soil Quality and Depth (BMP T5.13) Roofs •Full Dispersion (BMP T5.30) or Downspout Full Infiltration (BMP T5.10A) •Bioretention Stormwater Management Manual for Western Washington, Volumes I - V, Final, Amended December 2014. Washington State Department of Ecology (Ecology). Western Washington Low Impact Development (LID) Operations and Maintenance Manual (O&M), May 2013. Washington State Department of Ecology (Ecology). Western Washington Phase II Municipal It is also necessary to estimate flow reduction benefits of such designs when using the Western Washington Hydrologic Model (WWHM) or MGS Flood. The following provides recommended tests for the soils underlying bioretention areas.