DESCRIPTION
This grant proposal is to conduct an alternatives analysis for floodplain restoration design options within a 32-acre area interior to the proposed levee setback. Hydraulic modeling, building on existing two-dimensional models developed for this river reach, will be used to evaluate the effectiveness of restoration alternatives. Flood protection design alternatives will not be analyzed as part of this proposed work; rather the grant will be used to focus on interior restoration elements to directly benefit fish resources and habitat. Restoration techniques to be considered include but are not limited to large wood placement, excavation to create side channels, backwaters, or wetlands, native vegetation planting, and passive restoration techniques where the river is allowed to create new habitat over time. The grant deliverables will include an alternatives analysis report and conceptual design for the preferred restoration alternative.
King County proposes to conduct an alternatives analysis for floodplain restoration design options within a 32-acre area interior to a proposed levee setback on the White River. Hydraulic modeling that builds on existing two-dimensional models developed for this river reach will be used to evaluate the effectiveness of restoration alternatives. Flood protection design alternatives will not be analyzed as part of this proposed work; rather the grant will be used to focus on interior restoration elements to directly benefit fish resources and habitat. Restoration techniques to be considered include, but are not limited to, large wood placement, excavation to create side channels, backwaters, or wetlands, native vegetation planting, and passive restoration techniques where the river is allowed to create new habitat over time. The primary habitat type to be restored is juvenile salmonid rearing and refuge habitat. Priority species include White River spring Chinook, steelhead, and coho salmon. The grant deliverables will include an alternatives analysis report and conceptual design for the preferred restoration alternative.