Watershed Management Plan - Mason County

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Appendix C Key Issues and Options – Water Quality for maintenance of roadside ditches, including regular inspections and cleaning, planting of vegetation, and examination of culverts for evidence of scour. The manual also recommends – but does not require – that jurisdictions install bioswales and filter strips to treat runoff from roads, and to use engineered topsoils when needed to establish and maintain roadside vegetation. Bioswales are ditches ranging from two to ten feet in width that use plants and topsoil to filter pollutants from stormwater. A filter strip is a flat area that performs the same functions as a bioswale. Filter strips consist of a narrow band of gravel that borders a roadway and a wider swath of vegetation adjacent to the gravel (Washington Department of Ecology, 2001). The Planning Unit could request that the Washington Department of Transportation implement these recommended best management practices for treating stormwater runoff from highways, particularly when highway repairs are conducted. Option 51. Adopt the most current Stormwater Management Manual for Western Washington or equivalent manual The Puget Sound Water Quality Action Team’s Puget Sound Water Quality Management Plan (2000) calls for cities and counties to adopt a stormwater management manual to guide their water quality efforts. Specifically, the Management Plan encourages local governments to adopt the Department of Ecology’s Stormwater Management Manual for Western Washington. The most recent version of the manual was released in early 2005 (Washington Department of Ecology, 2005b). Should a local government opt not to adopt Ecology’s manual, the Management Plan recommends adopting an “equivalent” manual (Puget Sound Water Quality Action Team, 2000). Jurisdictions must submit their chosen manuals to Ecology for review and approval. Other manuals developed in Washington State include the 2005 King County Surface Water Design Manual (King County Water and Land Resources Division, 2005), and the Stormwater Manual for Eastern Washington, published in 2004 (Washington Department of Ecology, 2005c). Although King County is more urbanized than Mason and Jefferson Counties, significant portions of the county are still rural, with agriculture and forestry as primary land uses. Therefore, the King County manual may be useful in WRIA 16. The Eastern Washington manual likely is not appropriate for WRIA 16 because of climatic differences. The US EPA’s national best management practices for NPDES Stormwater Phase II can be downloaded from their website 14 . However, the EPA intends that these best management practices serve as guidance for local 14 http://cfpub.epa.gov/npdes/stormwater/menuofbmps/bmp_files.cfm page 120 Final Plan for County Adoption – May 11, 2006
Key Issues and Options – Water Quality Appendix C jurisdictions to create their own stormwater management programs, rather than as a manual. The Planning Unit could encourage local jurisdictions to adopt the updated version of the Stormwater Management Manual for Western Washington or an equivalent manual. Mason County adopted the 1992 version of Ecology’s manual in 1998 (Mason County Department of Public Works, 2005) and is still using it (Alan Tahja, Mason County, personal communication, April 26, 2005). Jefferson County adopted the 2001 version of the manual in 2002 (Jefferson County Department of Community Development, 2005). Option 52. Implement local stormwater management programs consistent with the Puget Sound Water Quality Management Plan The Puget Sound Water Quality Management Plan calls for cities and counties to create and implement comprehensive stormwater management programs that contain the following elements (Puget Sound Water Quality Action Team, 2000): • Ordinances that require the use of best management practices for new development and redevelopment. The Plan recommends that jurisdictions adopt Ecology’s Stormwater Management Manual for Western Washington or an equivalent manual to meet this program element. • Reviews of stormwater management designs for new development and redevelopment. • Regular inspection of construction sites. • Regular maintenance of permanent stormwater facilities, including those on private property. • Implementation of a program to eliminate sources of pollution from new development and redevelopment and already developed parcels. This element includes pollution from roadways and landscaping. • Prohibit illicit discharges and dumping. This element includes spill response. • Prioritization of areas that negatively affect water quality, aquatic species and their habitat, and hydrology. • Public education and involvement. • Adoption of ordinances that foster low impact development practices. • Participation in watershed or basin planning. • Provision of local funding for stormwater activities. Final Plan for County Adoption – May 11, 2006 page 121
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WRIA 16 Summary of Watershed Manage
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Chapter Introduction and Background
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Chapter WRIA 16 - State of the Wate
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Watershed Management Plan - Mason County

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