Policies & Regulations - 2009 Drainage Manual

Policies and Regulations - 2009 Drainage Manual

The Drainage Design and Erosion Control Manual for Olympia (Drainage Manual) establishes stormwater minimum requirements for new development, redevelopment and road projects of all sizes. Land developers and development engineers use the Drainage Manual to help design site plans, create construction stormwater site plans, and determine stormwater infrastructure. Businesses use the Drainage Manual to help design their stormwater pollution prevention plans.

The City of Olympia is required to regulate stormwater discharges to our municipal stormwater system and to waters of the state, in compliance with the Western Washington Phase II Municipal Stormwater Permit issued by the Washington State Department of Ecology (WDOE). The 2009 Drainage Manual has been modified to fulfill permit requirements for equivalency with the 2005 WDOE Manual.

The 2009 Drainage Manual is applicable to all development projects for which applications are submitted after October 20, 2009. 

2009 Drainage Manual

Printer-friendly versions (PDFs) of the current 2009 Drainage Manual are available below. For your convenience, we have provided a comprehensive table of contents and an overview of each volume.

• Table of Contents (2009 Drainage Manual) 
• Volume I (2009 Drainage Manual) Volume I of the Drainage Manual serves as an introduction and covers stormwater minimum requirements and several other key elements of developing the Stormwater Site Plan.
• Volume II (2009 Drainage Manual) Volume II covers best management practices (BMPs) for short-term stormwater management at construction sites (temporary erosion and sediment control)
• Volume III (2009 Drainage Manual) Volume III covers hydrologic analysis and BMPs to control flow volumes from developed sites.
• Volume IV (2009 Drainage Manual) Volume IV addresses BMPs to minimize pollution generated by potential pollution sources at developed sites.
• Volume V (2009 Drainage Manual) Volume V presents BMPs to treat runoff that contains sediment or other pollutants from developed sites.

More Information

If you have questions about the 2009 Drainage Manual, please email publicworks@ci.olympia.wa.us or call Eric Christensen at 360.570.3741. 

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Contact Information:

• Visit our City Services page for links to other City Services and contact information (phone numbers) 
• Contact us at publicworks@ci.olympia.wa.us