This document, king countys 2009 stormwater management program swmp describes the. Stormwater management manual for western washington, the associated city may request more stringent standards depending on the project location. King county stormwater pollution prevention manual best management practices for commercial, multifamily and residential properties, dated april 2016. The manual provides detailed information for businesses, residents, managers, and owners of property in unincorporated king county, and describes the actions we are all required to take to reduce the contamination of stormwater, surface water, and groundwater, to comply with federal clean water act requirements. Describes the reasons for improving stormwater management and provides the principles, objectives, key roles and responsibilities for stormwater management in wa. Direct discharge exemption king county, washington. This manual, the 2009 city of kenmore stormwater pollution prevention manual, is a modified version of that king county manual. This dataset is intended to show the point locations of stormwater facilities for planning and maintenance purposes. Department of public works preapproved plans policy policy d10. In 1998, king county promulgated a stormwater technical manual and. City of olympia stormwater manual january 2005 the 2005. The 2009 draft update of king county stormwater pollution prevention manual sppm click here or on the title above to download the draft sppm 2.
The city of gig harbor has not adopted the manual to date and is currently using a design manual developed by the city in 2001 and updated in july 2006. The stormwater code and manual are in the process of being updated and are scheduled. The 2009 king county stormwater pollution prevention manual was developed by king county and adopted for use within unincorporated king county in january 2009. The stormwater management manual for western washington swmmww provides guidance. Pursuant to king county council adoption of ordinance 18257, the department of natural resources and parks adopted a public rule revising the king county surface water design manual swdm. This manual replaces the king county stormwater pollution prevention manual, best management practices for businesses, dated january 2009. Thurston county drainage design and erosion control manual and is intended to comply with the national pollutant discharge elimination system npdes phase ii permit issued to thurston county by the department of ecology and be equivalent to the stormwater management manual for western washington ecology 2005. Treatment of pollution generating impervious surface pgis in accordance with the 2012 washington state department of ecology stormwater management manual for western washington is always required.
The county must provide more detail about the goals of. Washington state department of ecology water quality program. All new development and redevelopment will need to follow new stormwater standards from the 2011 city of snoqualmie addendum to the 2009 king county surface water design manual. Water quality planner, king county stormwater services section. King county 2009 surface water design manual, appendix amaintenance requirements for flow control, conveyance and wq facilities. Errata to king countys 2009 surface water design manual and supporting. Pierce county stormwater management and site development manual.
The kcrts program utilizes a set of files containing unitarea continuous runoff records runoff files. Under the 2007 permit, all county development projects including those located in other. In may 2014, dpd published the draft 2015 city of seattle stormwater code and stormwater manual, volumes 1 through 5, and the appendices. Stormwater management in western washington access wa. The 2012 washington state department of ecology stormwater management manual for western washington is a technical document. Introduction this appendix presents hydrologic modeling concepts to support the design of stormwater best management practices bmps that meet minimum requirements in the stormwater code and in. Describes what stormwater is and outlines the purpose of the manual, the intended audience of the manual and how the manual can help. Manual kcswdm and city of renton amendments to the 2009 kcswdm is. Runoff treatment bmps, chapter 5, pages 57 to 510 or pages 95. The hard copy of the 2009 swdm is available for purchase at the water and land resources division office at 201 s. Volume i minimum technical requirements and site planning prepared by. Swdm signed public rule and summary of changes 20092016. Addendum to the king county surface water design manual.
City of issaquah 2017 stormwater design manual addendum 2 p a g e new technical manual. This dataset shows the locations of stormwater facilities for the control of stormwater or water quality improvement. Stormwater management manual for western washington. Equivalent stormwater manuals for municipal stormwater. Stormwater management manual for western washington volume ii construction stormwater pollution prevention prepared by. Contaminants shall be controlled by implementing appropriate source control bmps, as described in the 2016 king county stormwater pollution prevention manual. Thurston county drainage design and erosion control manual. I1 kcrts getting started november 1, 2009 introduction the king county runoff time series kcrts program was developed as a hydrologic modeling tool for western king county. These maintenance standards comply, or exceed compliance, with the. The 2005 stormwater manual has been superseded by the 2009 drainage manual. Code update effort seattle 2009a, 2009b, the technical and policy changes associated.
Volume iii hydrologic analysis and flow control bmps. Issaquah creek basin and nonpoint action plan, king county surface water management. All figures in chapter 4 are courtesy of king county. Per requirements in king countys phase 1 municipal stormwater permit effective date. Surface water design manual king county, washington pursuant to king county council adoption of ordinance 18257, the department of natural resources and parks adopted a public rule revising the king county surface water design manual swdm. If you have questions about ordering the stormwater manual, please call the department of printing at 360 7536820. Stormwater discharges associated with industrial activities, october 21, 2009. Addendum to the 2016 king county surface water design manual this addendum to the 2016 king county surface water design manual kcswdm applies to. Included in the adoption of the king county manual is this city of renton amendments to the 2009 king county surface water design manual.
Best management practices for onsite stormwater management. Guidelines and resources for implementing soil quality and depth bmp t5. King county surface water design manual update project. Stormwater manual 11 january 1, 2009 lexingtonfayette co. West virginia department of environmental protection. How to find the stormwater management manual on the internet the stormwater management manual for western washington is also available on ecologys stormwater homepage. Stormwater manuals washington state department of ecology. Stormwater pollution prevention manual 2016 guide describing best management practices for businesses, residents, managers, and owners of property in unincorporated king county to apply to reduce the contamination of stormwater, surface water, and groundwater.
This section of the water and land resources division is responsible for coordinating the countys compliance with state and federal stormwater management regulations that protect water quality and for implementing a variety of stormwater management programs integral to this compliance as well as to the protection. The city currently follows the 2009 king county surface water design manual. Appendix f hydrologic analysis and design stormwater manual directors rule 172017dww200 august 2017 f1 f1. Stormwater permit issued by the washington state department of ecology. The amendment revises chapters 1 and 2 in their entirety and identifies changes to the remainder of the king county manual to reflect city of renton specific requirements. B at right, and meets the following criteria for direct discharge26 to that receiving water. To adopt the 2016 edition of the stormwater pollution prevention manual, which is an update to the 2009 stormwater pollution prevention manual to improve clarity and be equivalent with the states 2014 stormwater management manual for western washington.
City of sammamish 2009 stormwater management program. The project objective is to update the king county surface water design manual kcswdm to achieve equivalency with ecologys 2012 stormwater management manual for western washington smmww as required by the 202018 npdes phase 1 municipal stormwater permit. The thurston county drainage design and erosion control manual ddecm. Stormwater management manual for western washington swmmww.
Under the 2009 permit, all county development projects including those located in other. It is our intent to maintain equivalency with the 2012 ecology stormwater management manual for western wa. P er requirements in king countys phase 1 municipal stormwater permit effective date. Stormwater facilities whatcom county, wa official website. City of sammamish 2009 stormwater management program march 2009 5583847003 iii acronyms city city of sammamish ecology washington state department of ecology gis geographic information systems idde illicit discharge detection and elimination kcc king county code kcswdm king county surface water design manual.
Seattle dpd stormwater best available science seattle. Figures in chapter 7 through 12 are reproduced, with permission, from king countys surface water design manual, except where otherwise noted. The city ofissaquah adopts the 2009 king county surace water design manual king county manual for the design, construction and maintenance of stormwater management systems and facilities that are approved though the development permt process. The washington state department of ecology is solely responsible for any errors, omissions, and final decisions related to the 2012 swmmww.
Ecologys stormwater management manual for western washington. Permittee, including the city of gig harbor, adopt the 2005 stormwater management manual for western washington manual or an equivalent. The city of sammamish has adopted the 2009 king county surface water design manual 2009 kcswdm in order to be in compliance with its phase ii municipal stormwater permit. Ecologys 2005 stormwater management manual for western washington 2005 manual and must meet newly established standards for staff training and inspections. Three concepts, the public drainage system, the waters of fayette county, and postdevelopment floodplains are important to the management of. King county stormwater pollution prevention manual the most recent. The 2016 king county surface water design manual has been approved by. Flow control 2009 surface water design manual 12015 7 direct discharge exemption any onsite natural drainage area is exempt from the flow control facility requirement if the area drains to one of the major receiving waters listed in table 1. Washington state department of ecology water quality program february 2005 publication no. City of kent maintenance standards for stormwater flow.
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