Seattle dpd stormwater best available science seattle. Mcintyre, phd 360 9022216 fax 360 9022215 walter f. 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. Included in the adoption of the king county manual is this 201 i city of. Under the 2009 permit, all county development projects including those located in other. Clark county pollution control manual, published by. The citys phase 2 municipal npdes stormwater permit requires the city to adopt the 2005 stormwater manual for western washington or an equivalent manual. Toc ii volume v stormwater treatment bmps october 2009 drainage design and erosion control manual for olympia acknowledgements this manual volume largely incorporates the contents of ecologys 2005 stormwater management manual for western washington, volume v. 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. Surface water design manual addendum preface how to use this. King county surface water design manual update project. Management manual for western washington, soils for salmon 2012. 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. City of sammamish 2009 stormwater management program.
Stormwater management manual for western washington volume ii construction stormwater pollution prevention prepared by. This dataset shows the locations of stormwater facilities for the control of stormwater or water quality improvement. Stormwater management regulations clark county washington. Swdm signed public rule and summary of changes 20092016. King county surface water management, best management practices for businesses, july 1995. The city of kenmore adopted the 1998 king county surface water design manual kcswdm with modifications as the standard for stormwater runoff control. Per requirements in king countys phase 1 municipal stormwater permit effective date august 1, 2019, projects permitted under earlier versions. Jon cassidy king county, department of transportation ron devitt dept. Permittee, including the city of gig harbor, adopt the 2005 stormwater management manual for western washington manual or an equivalent. The modified western washington phase ii municipal stormwater permit and 2014 ecology stormwater management manual are available on ecologys website. Stormwater management manual for western washington, the associated city may request more stringent standards depending on the project location. In addition, ecology has approved the 2009 king county manual as equivalent to the ecology manual.
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 redevelopment such that they comply with water quality standards and contribute to. In addition, both the 2019 draft of the western washington phase ii municipal stormwater permit and 2019 draft of the ecology stormwater management manual are available on ecologys website. The requirements of the manual also apply to crossjurisdictional projects e. Under the 2007 permit, all county development projects including those located in other. Washington state department of ecology water quality program. Phase i permits contain additional requirements for water quality monitoring and retrofits. This is the august 2012 version of the stormwater management manual for western washington swmmww. Vol i vegetationlined channels designed to remove suspended solids from stormwater hrm, 54. The 2012 washington state department of ecology stormwater management manual for western washington is a technical document. Stormwater permit issued by the washington state department of. In cooperation with washington county and our 12 member cities, we build, maintain and enhance the public drainage system to meet public needs and to comply with strict water quality regulations set for the tualatin river drainage area by the oregon department of. The stormwater code and manual are in the process of being updated and are scheduled. Previously the city retained this threshold from earlier king county manuals because this was allowed by the phase ii permit. Stormwater discharges associated with industrial activities, october 21, 2009.
In 1998, king county promulgated a stormwater technical manual and. 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. Thurston county drainage design and erosion control manual. Adopt the 2012 stormwater management manual for western washington in its entirety. City of olympia stormwater manual january 2005 the 2005. The stormwater npdes permit sections s4 and s5 states. Ecology prepared the 2005 stormwater management manual for western washington to provide technical guidance to control the quantity and quality of stormwater runoff from new developments and redevelopments. 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. 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. Surface water design manual, king county, washington, january 9, 2009. Stormwater management in western washington access wa.
City of seatac stormwater management program march 2012. There are several options for complying with this permit condition. Describes the reasons for improving stormwater management and provides the principles, objectives, key roles and responsibilities for stormwater management in wa. Stormwater manuals washington state department of ecology. As water runs off these surfaces, it can pick up pollution such as oils and dirt. Focus on stormwater management manual for western washington from ecologys water quality program the department of ecology ecology has published an update to its stormwater management manual for western washington. Wdwf integrated streambank protection guidelines, published by washington department of fish and wildlife. Best management practices for onsite stormwater management. Direct discharge exemption king county, washington. Volume iii hydrologic analysis and flow control bmps. 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. January 2005 olympia stormwater manual volume v tociii. 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. The 2012 edition of the department of ecologys stormwater management manual for western washington swmmww, as amended in december 2014, is hereby adopted by reference the stormwater manual.
Stormwater management manual for western washington august 2012. Review of stormwater management manual for western. 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. An accurate count of washington residents will ensure the fair distribution of political representation and of federal and state resources. The proposed changes to the manual are seen as track changes edits. Seattle department of parks and recreation, seattle, washington. Adoption of the pierce county surface water design. All figures in chapter 4 are courtesy of king county. Seattle department of parks and recreation, seattle. Management manual for western washington ecologys manual as noted in appendix 1 of the permit or an equivalent manual.
If your project requires the use of this manual, consultation from a licensed civil engineer may be required. Attachment 5 references washington state department of. This manual volume largely incorporates the contents of ecologys 2001 stormwater management manual for western washington, volume v. Volume i minimum technical requirements and site planning prepared by. This document, king countys 2009 stormwater management program swmp describes the. Npdes western washington phase ii municipal stormwater permit phase ii. Contaminants shall be controlled by implementing appropriate source control bmps, as described in the 2016 king county stormwater pollution prevention manual. Stormwater is rain that runs off hard surfaces such as rooftops, paved streets, and parking lots. Facilities covered under ecologys industrial stormwater general permit. Untreated stormwater might flow directly into a local stream, river, or lake negatively impacting the habitat or wildlife. Ecologys i i4 stormwater management manual for western washington, replacing the previously adopted 2009 king county surface water design manual. Surface water design manual king county, washington.
Ecology prepared the 2005 stormwater management manual for western washington to. Stormwater management manual for western washington. 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. Persons with hearing loss can call 711 for washington relay service persons with a speech disability can call 8778336341. B at right, and meets the following criteria for direct discharge26 to that receiving water. A vertical maintenance access to a vault, tank or other similar structure. Clark county stormwater manual 2015 i introduction to the manual. The manual represents ecologys latest guidance on strategies to prevent and reduce the harms of stormwater pollution. This dataset is intended to show the point locations of stormwater facilities for planning and maintenance purposes. Summary of major changes between the 1998 and 2009 king.
Review of stormwater management manual for western washington august 2001 independent science panel kenneth p. Drainage design and erosion control manual for olympia. How to find the stormwater management manual on the internet the stormwater management manual for western washington is also available on ecologys stormwater homepage. Programs equivalent to the 2014 stormwater management manual for western washington. If you have questions about ordering the stormwater manual, please call the department of printing at 360 7536820. 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. Pierce county stormwater management and site development manual. Describes what stormwater is and outlines the purpose of the manual, the intended audience of the manual and how the manual can help. Focus on stormwater management manual for western washington. The protective design standards are found in the state stormwater manual, first adopted in 1992 and updated in 2005 for western and eastern washington.
The project is partially supported by a national estuary. Dnrpwlrd stormwater services section sws description. King county, washington the 2009 draft update of king county surface water design manual swdm click here or on the title above to download the draft swdm mb. King county, washington surface water design manual 2 016 requirements and standards for designing surface and storm water management systems in king county to mitigate the impacts of new development and redevelopment on natural and existing manmade drainage systems. Per the city of rentons national pollutant discharge elimination system npdes permit, it is required to adopt updated surface water design standards that are equivalent to portions of volume 1 of the 2012 stormwater management manual for western washington, as amended in 2014, by december 31, 2016. Stormwater pollution prevention manual king county. In 2009 the city of seatac adopted an illicit discharge detection and. Washington state department of ecology water quality program february 2005 publication no. 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. The 2005 stormwater manual has been superseded by the. Pursuant to king county council adoption of ordinance 16264, the department of natural resources and parks adopted a public rule revising the king county surface water design manual swdm. Code update effort seattle 2009a, 2009b, the technical and policy changes. The state of washington was a coplaintiff and partner in these settlements.
Our stormwater manuals provide stormwater permit implementation and management guidance. Clean water services is the regional swm utility for urban washington county. Ecologys 2005 stormwater management manual for western washington 2005 manual and must meet newly established standards for staff training and inspections. 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.