River and Floodplain Management Unit
The River and Floodplain Management Unit is responsible for carrying out programs and implementing projects that reduce flood damages and protect public safety along King County's major rivers.
King County Flood Control Zone District
established in April, 2007 by the Metropolitan King County Council to protect public health and safety, regional economic centers, public and private properties and transportation corridors.
2006 King County Flood Hazard Management Plan (Final, Adopted January 2007)
This functional plan of the King County Comprehensive Plan proposes a much-needed fix to King County's aging system of 500 levees and revetments that protect urban and rural floodplain residents, businesses, regional economic centers, public infrastructure and roads.
Biological Effects Analysis Report
Published in October 2003 to determine the potential effects of the King County River Management Program on endangered, threatened, and candidate salmonids. Based on the results of this analysis, the County could decide if any elements of the River Management Program might require modification to come into compliance with the Endangered Species Act (ESA).
Bank Stabilization and Levee Setback Projects
Projects are designed to reduce risks to public health and safety, protect infrastructure and provide habitat components in compliance with natural resource regulations.
Guidelines for Bank Stabilization Projects: in the Riverine Environments of King County
Published in June 1993 to assist scientists and engineers with the design of bank stabilization projects for river and streambank protection. The Guidelines document is a practical guide for assessing erosion problems, evaluating alternative solutions and designing and constructing a bank stabilization project.
Levee and Revetment Routine Maintenance
Nearly 500 levees and revetments exist along King County rivers. Inspections and maintenance occur regularly on these river facilities.
Green River Flood Control Zone District
The District is an interjurisdictional flood hazard reduction and resource management program that includes the operation, maintenance and repair of flood protection facilities and pump station on the lower Green River.
Flood Warning System
The system is designed to warn and provide information to residents and agencies about impending floodwaters on major rivers so they can take action and prepare themselves before serious flooding occurs. The web site links to real-time river gage data and describes the local flooding homeowners can expect at different flood phases based on past flood events.
Home Buyouts and Elevations in flood prone areas
The home elevation program assists property owners with the costs of raising the finished floor of a home above the 100-year elevation, substantially reducing the threat of future damage. Home buyouts provide a permanent solution to the risks and damages of repetitive flooding.
Floodplain Mapping and Channel Migration Hazard Mapping
Flood and channel migration hazard areas are identified and mapped. These hazard areas are regulated to limit or prevent at-risk development. Since 1991, updated flood boundaries have been mapped on nearly 80 miles of river, and channel migration zones along 46 miles of river.
River Planning
This program element includes ongoing activities and special studies related to river corridor management, ecologically guided floodplain restoration, public safety, and flood hazard reduction.
Snoqualmie River 205 Project
This project was designed to reduce flood elevations in and around the City of Snoqualmie.
Boater Safety
Information about boating on the rivers of King County is provided with maps and photos of projects containing large woody debris.
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