2017 Update to the Stormwater Management Manual for Eastern Washington

We are supporting and leading the effort to update the 2004 Stormwater Management Manual for Eastern Washington (manual) as it has been over 10 years since the manual was written.

Our goal is to update certain sections of the manual to:

Learn more and help us improve the manual

This manual will guide stormwater management in Eastern Washington for years to come. Your input will help us create guidance that protects water quality while being useful and applicable to Eastern Washington communities.

Sign up for the project webinar:


Meeting handouts:

Handout 1 – redevelopment
Handout 2 – flow chart
Handout 3 – BMP list
Handout 4 – UIC guidance

Date: June 27, 2017
Time: 10:00 a.m. – noon
Sign up at Register for Municipal Stormwater Management Manual for Eastern Washington: Project Update

Provide comments on needed changes to the manual

You may provide comments on this comment spreadsheet (EXCEL). Email comments to SMO-EasternWAStormwaterManualUpdate@herrerainc.com.

Sign up for email updates at the STORMWATER-EASTERN-WA Home Page.

Opportunities to review and provide input:

2017 Update to Stormwater Management Manual-Eastern WA


Project objectives

We are funding and managing a consultant team to draft the language to be considered and used in the updated manual.

In early 2016, an advisory steering committee was convened to assist us in selecting the consultant team. The advisory committee will help to identify and set priorities, as well as review proposed content changes for the manual update.

Those not on the steering committee can participate through by reviewing and commenting on draft documents/language and participating in meetings or workshops.

Content update – preliminary thoughts


January 8, 2016 – Initial kick-off meeting.

June 27, 2017 10 a.m. – noon: Project Webinar – sign up at Register for Municipal Stormwater Management Manual for Eastern Washington: Project Update

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How to Get a Copy of the Stormwater Management Manual for Eastern Washington (2004)

You can download and print the Stormwater Management Manual for Eastern Washington or you may purchase it from the Department of Printing (Publication Number 04-10-076).

Corrections and Clarifications to the Stormwater Management Manual for Eastern Washington

Chapter 2 - Core Elements for New Development and Redevelopment

Chapter 4 - Hydrologic Analysis
     Isopluvial maps with Township and Range

Chapter 5 - Runoff Treatment Facility Design

Chapter 6 – Flow Control Facility Design

Chapter 7 - Construction Stormwater Pollution Prevention

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Ecology’s Stormwater Management Manual for Western Washington was originally published in 1992 and updated in August 2001. Ecology initially proposed to update it to cover the entire state of Washington. Eastern Washington representatives requested that Ecology instead create a separate manual for the eastern portion of the state.

Based upon these requests and upon recognition of the significantly different climate, hydrology and geology of eastern Washington, Ecology agreed to develop the Stormwater Management Manual for Eastern Washington to address the significant differences in conditions that affect stormwater compared to western Washington.

Discussions at various conferences, meetings and forums to determine the best method to accomplish this effort. A chartering meeting was held in June 2001 to formalize the structure and process for preparing the Manual for eastern Washington. The meeting was attended by more than 70 representatives of 17 cities, 11 counties and 5 federal and state agencies with interests in stormwater management in eastern Washington.

The chartering meeting established a ten-person Steering Committee with several alternate members to lead the overall effort; it also created two Subcommittees: one for leading the preparation of the Technical Stormwater Manual, and another for leading the preparation of a Model Municipal Stormwater Program. Ecology agreed to fund the hiring of a consultant team to support the development and preparation of the documents and to assist the Steering Committee and Subcommittees with meeting coordination, public involvement and related project tasks. Proposals were received by four consultant teams in October 2001; the Steering Committee selected the team lead by Tetra Tech/KCM of Spokane.

A project kick-off meeting was held on November 7, 2001 with members of the Steering Committee, Ecology, and the consultant team. The scope of work for the project and a proposed production schedule were prepared; a budget was prepared and the work began. A stakeholder workshop was held on November 29, 2001 to inform interested parties about the project efforts, the regulatory requirements, the schedule for meetings, and the document production format. After the introductory sessions, concurrent meetings of the Subcommittees were held to begin the development of the Manual and the Model Program. Meetings were held at least once per month to review drafts and updates for each chapter of each document. Periodic presentations were made to address special stormwater management issues. These efforts resulted in draft documents being submitted for public review in fall 2002.

Following the public comment period, the subcommittees reviewed all of the comments received on both of the documents and agreed to minor revisions to the Model Program and substantive revisions to the Manual. The final Model Program was published in September 2003. The Manual underwent a second round of public review in summer 2003. The Stormwater Management Manual for Eastern Washington (2004) is the result of the subcommittee’s final review of those comments.

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Technical Assistance on the Manual Stormwater Management Manual for Eastern Washington

For questions on chapters 1-6 and 8, contact Doug Howie at douglas.howie@ecy.wa.gov or 360-407-6444.

Foroozan Labib (foroozan.labib@ecy.wa.gov or 360-407-6439) can also assist with questions on chapters 4 and 6.

For questions on chapter 7, contact Amy Moon at amy.moon@ecy.wa.gov or 360-407-6467.

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