Stormwater retrofit planning project for Green River Watershed
This project estimated the amount and cost of stormwater infrastructure that would be needed in the Duwamish River Watershed, or Water Resource Inventory Area (WRIA) 9, to improve stream flow and water quality to levels comparable to those found under fully forested conditions. The study accounted for existing stormwater infrastructure, anticipated population growth, and climate change impacts. Cost estimates for constructing stormwater retrofits throughout the Puget Sound basin were also derived via extrapolation of results. The project was funded by a grant from the USEPA, with match from King County, University of Washington, and the cities of Auburn, Covington, and Seatac. For more information, review the detailed work plan (Acrobat PDF).
Documents are provided in Adobe Acrobat format.
- Project management documents
- Project documents
- Workshop documents
- Technical documents
- Grant documents
Project management documents
Project Management Team Meeting, June 5, 2014
- Meeting Minutes (244 Kb)
Project Management Team Meeting, January 16, 2014
- Agenda (75 Kb)
- Meeting Minutes (107 Kb)
- SUSTAIN Model Results (638 Kb)
Project Management Team Meeting, Dec. 4, 2013
- Agenda (76 Kb)
- Meeting Minutes (105 Kb)
Project Management Team Meeting, Sep. 19, 2013
- Agenda (75 Kb)
- Meeting notes (65 Kb)
- Project status (68 Kb)
- Project schedule update (71 Kb)
- Modeling status (796 Kb)
- Proposed method for assessing amount of existing detention in study area (103 Kb)
- Proposed method for assessing impacts of climate change (71 Kb)
Project Management Team Meeting, June 5, 2013
- Agenda (75 Kb)
- Meeting Minutes (59 Kb)
Project Management Team Meeting, March 6, 2013
- Sign-in Sheet (193 Kb)
- Agenda (53 Kb)
- Meeting Minutes (119 Kb)
- Project Status (49 Kb)
- Grant Timeline (45 Kb)
- O&M Costs Investigation (70 Kb)
- Preliminary Results (4.6 Mb)
- UW Project Updates (336 Kb)
Project Management Team Meeting, Dec. 13, 2012
- Meeting agenda (217 Kb)
- Attendee sign-in sheet (118 Kb)
- Meeting minutes (673 Kb)
- Project status (185 Kb)
- Frequently asked questions (330 Kb)
- WRIA 9 Stormwater Retrofit BMP Cost Assumptions (333 Kb)
- HSPF model status (22 Kb)
- HSPF model map (612 Kb)
- Meeting handout - Olivia Wright and Erkan Istanbulluoglu (289 Kb)
- Project Poster, Restoring the hydrologic response to pre-developed conditions in an urbanized headwater catchment: Reality or utopia? (1.2 Mb)
- Meeting handout - SUSTAIN Model cost-effectiveness graphs (436 Kb)
- Correction - SUSTAIN Model cost effectiveness vs. B-IBI score graph (60 Kb)
Project Management Team Meeting, Sept. 13, 2012
- Meeting agenda (216 Kb)
- Meeting minutes (145 Kb)
- Cost Assumptions, WRIA 9 Stormwater Retrofit BMP (295 Kb)
- Design Assumptions, WRIA 9 Stormwater Retrofit BMP (370 Kb)
- Basin Scale Concept Validation: Urban Hydrology Model (2.2 Mb)
- Hydrologic model schedule (107 Kb)
- Stormwater Retrofit Analysis and Recommendations for Juanita Creek Basin in the Lake Washington Watershed
- UW Student Workshop Papers
Project Management Team Meeting, June 5, 2012
- Meeting notes (218 Kb)
- Basin-scale Concept Validation: Newaukum Urban Approaches (2.26 Mb)
- SUSTAIN modeling status (372 Kb)
- Watershed modeling status (771 Kb)
Table describing status and schedule for model completion by sub-basin.
Project Management Team Meeting, March 22, 2012
- Meeting agenda (75 Kb)
- Meeting notes (76 Kb)
- Target application proposed procedures (148 Kb)
Criteria for development of BMP's for biological-hydrological indicators (B-IBI) and water quality indicators.
- Basin Scale Bioretention Concept Validation: Newaukum Urban Approaches (1.3 Mb)
Analysis of BMP scenarios and costs for rainfall and surface runoff storage.
- Analysis of rooftop, road, driveway/parking lot, sidewalk, lawn, pasture/agriculture, and forest areas in WRIA 9 (14 Kb)
Proposed project to digitize impervious areas from high-resolution orthophotos and field-checks for comparison to data derived from remote sensing.
Meeting minutes, WRIA 9 Retrofit Project Management Team, December 8, 2011 (254 Kb)
Project Management Team meeting summary, May 19, 2011 (252 Kb)
Salish Sea Conference, May 2014
- Strategies for Fixing Puget Sound’s Stormwater Problem (2.21 Mb)
- Modeling cost-effective solutions to meet flow and water quality targets (700 Kb)
Stakeholder Workshop #4, February 27, 2014
- Agenda (15 Kb)
- Meeting Notes (289 Kb)
- Agenda (15 Kb)
- Meeting minutes (108 Kb)
- Table discussion summary final (132 Kb)
Workshop presentations, January 26, 2012
- Meeting Minutes (228 Kb)
- Overview - Stormwater Retrofit Planning Project for WRIA 9 (1.5 Mb)
Presentation by Jim Simmonds
- Development of a Stormwater Retrofit Plan for Water Resources Inventory Area (WRIA) 9 and Estimation of Costs for Retrofitting all Developed Lands of Puget Sound (1.2 Mb)
Presentation by Richard Horner
- SUSTAIN Sub-Basin Scale Pilot Concept (1.4 Mb)
Presentation by Curtis DeGasperi
Project workshop summary, April, 2011 (391 Kb)
Project workshop attendees, April 2011 (59 Kb)
Wright Masters Thesis Modeling Hydrologic Response of Urban Watersheds to Restoration (external link)
Existing Flow Control Facilities in WRIA 9 (298 KB)
Climate Change Impacts on Stormwater Management (1.1 MB)
Population Growth, New and Re-development, and Stormwater Management by 2040 (4.4 MB)
Final SUSTAIN Stormwater Infrastructure Modeling Report (2.6 MB)
WRIA 9 Stormwater Retrofit Plan Needs and Cost Assessment and Project Summary Report (2.5 MB)
Final SUSTAIN Model Pilot Study (5.5 Mb)
Final Flow and Water Quality Indicators and Targets (593 Kb)
Watershed Model Development for Water Resource Inventory Area (WRIA) 9 Stormwater Retrofit Planning Project (7.8 Mb)
Data Report for Field Data Collection for the Development of a Stormwater Retrofit Plan for Water Resources Inventory Area (WRIA) 9 (19 Mb)
Amended Existing Data Review For the Development of a Stormwater Retrofit Plan for Water Resource Inventory Area (WRIA) 9: Historical Flow, Total Suspended Solids, and Turbidity Data, December 2011 (12.4 Mb)
Status Report, Development of Flow and Water Quality Targets, January 5, 2012 (283 Kb)
Hydrologic Indicators (511 Kb)
Rankings, illustrative graphs and definitions of candidate hydrologic criteria.
Project data collection map (3.5 Mb)
Existing and proposed gage locations within the project area.
SUSTAIN - System for Urban Stormwater Treatment and Analysis INtegration (2.1 Mb)
Descriptive illustration for an ArcGIS-based modeling application designed to help select and strategically place Best Management Practices (BMPs) and Low Impact Development (LID) techniques in urban watersheds.
Water quality indicators (2.4 Mb)
Land use and cover map, graphs and summary of water quality indicators in the project area.
HSPF watershed modeling (2.8 Mb)
Visual description of hydrologic model inputs and products.
Development of Flow and Water Quality Indicators (187 Kb)
April, 2011 status report by Dr. Richard Horner, University of Washington.
Quality Assurance Project Plan (QAPP) for Field Data Collection for the Development of a Stormwater Retrofit Plan for Water Resource Inventory Area (WRIA) 9 (956 Kb)
This plan describes the activities associated with field data collection for developing a Stormwater Retrofit Plan for Water Resource Inventory Area (WRIA) # 9 in King County, Washington. It describes the strategy and methods the project will use to ensure that the project is being managed, developed, and deployed in a sound, reasonable way; and that the project's deliverables are of acceptable quality before they are delivered to the project's clients.
Partner agencies, study area map, objectives and schedule (4.5 Mb)Poster summarizes the who, what, where and why for the Stormwater Retrofit Planning Project for WRIA 9 (Green River).
Project overview (36 Kb)
The steps planned for this project.
Project Work Plan for developing the Stormwater Retrofit Plan for Water Resource Inventory Area (WRIA) 9 (141 Kb)
This plan outlines the project’s purpose; existing conditions; and summary of tasks, participants, components, budget, schedule, location, including approach, anticipated outcomes, deliverables, and products.
For more information about the Stormwater Retrofit Project, please contact Jim Simmonds, Project Manager, Science and Technical Support Section.
- Water Resource Inventory Area (WRIA) 9 habitat restoration
- Stormwater services and information
- Sustainable building
- Low impact development (external link)