Watershed Assessment of Manzanita
Manzanita watershed on Bainbridge Island presents an opportunity to design and implement stormwater improvements in accordance with landowner willingness, cost effectiveness, and greatest ecological lift.
Other studies have recognized that this watershed has great potential to regain hydrologic balance and provide intact riparian habitat to support Puget Sound recovery.
The city is currently working with their consultant and other project partners to understand the watershed processes through data gathering, GIS analysis and field observations.
July 2022: Project locations were identified by the Steering Committee and ranked based on their effectiveness to restore streamflow. Out of 13 feasible locations, 6 projects were identified as having opportunity to treat unmitigated stormwater and improve streamflow. Of the 6 projects, the 2 highest ranking projects were selected to move on to the design phase. The city’s design consultant is currently working to develop preliminary designs for these sites. See attachment under “related documents” for site locations.
- 01/12/23 Steering Committee
The Steering Committee, Consultant Herrera, and City staff met onsite to review the 30% design details for the stormwater retrofit at the Bainbridge Island Native Food Forest (BINFF) on Charles Place.
- 7/21/22 Field trip to top 2 sites
- Salish Sea Conference 2022
- Green Infrastructure Summit 2022
- Restore & Protect Presentation by Kate Macneale, King County Presentation:
- WAM Story Map Presentation:
- Stormwater Control Transfer Program Overview:
- National Estuary Program, EPA
- Administered by the Stormwater Initiative, WA DOE
This project has been funded wholly or in part by the United States Environmental Protection Agency under assistance agreement PC-01J18101 to the Washington State Department of Ecology. The contents of this document do not necessarily reflect the views and policies of the Environmental Protection Agency, nor does mention of trade names or commercial products constitute endorsement or recommendation for use.
- Final Issue Paper on Alternative Funding Mechanisms
- Kitsap Conservation District Rain Garden Report
- Preliminary (30%) Design Summaries
- Site Locations
- Infiltration Feasibility Assessment Technical Memo
- WRIA 15 Streamflow Restoration Planning
- King County Restore and Protect
- COBI Surface Water Management Plan 2001
- Near Term Action (NTA) Puget Sound Partnership
- Watershed Assessment of Manzanita - Fact Sheet
- Manzanita Water Flow & Sediment Export Potential Assessment - August 2021
- Manzanita Watershed Analysis Map
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