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The removable spillway weir -- also referred to as the RSW -- is a prototype concept to pass juvenile fish over a spillway. At Corps dams on the lower Snake River, juvenile fish can pass three ways:
Juvenile fish tend to be surface oriented and surface flow is thought to be a more effective method to pass fish than existing pressurized 50-foot deep flow under current spillgates. The expected advantages of the RSW are improved passage conditions for fish by reducing injury and passage delays at the dams. It is anticipated that the surface flow will result in more efficient juvenile fish passage rates (more fish per unit of flow) than conventional deep gates at the spillway, as well as potential for lower dissolved gas levels in the river by more efficient use of water to bypass juvenile fish to below the dam.
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The POC for this page:Engineering Division CENWW-ED |
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