Lower Granite Fish Guidance Efficiency System Model Study—Snake River, Washington

by Robert A. Davidson, US Army Corps of Engineers Waterways, Experiment Station, Vicksburg, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


With the annual migration of adult salmon up the Columbia and Snake Rivers and the migration of their offspring (juvenile salmon) downstream to the ocean, new problems have developed with regard to the juvenile salmon successfully completing their journey to the ocean. With the damming of the rivers for navigation and hydropower, the juvenile salmon have to pass through the powerhouses because of their inability to use fish ladders located at each structure. Tests were conducted at the Waterways Experiment Station on a 1:25-scale one-bay intake unit physical model to improve the fish guidance efficiency of the juvenile bypass system at the lower Granite Powerhouse. Modifications to the juvenile bypass system involving the submerged traveling screen, different positions of the emergency closure gate, blocked trashracks, and various other modifications in the vicinity of the submerged traveling screen were tested to achieve this purpose. This paper focuses on the modifications that were found to have the greatest potential for improving the efficiency of the system.

Subject Headings: Fish management | Hydrologic models | River systems | Ocean engineering | Submerging | Power plants | Hydro power | High-rise buildings | Washington | United States

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