Development of a Multi-Beneficial Surface Bypass Alternative for Juvenile Fish Passage at McNary Dam
Publication: World Environmental and Water Resources Congress 2008: Ahupua'A
Abstract
As part of a comprehensive program to enhance juvenile fish passage at McNary Lock and Dam to improve the survival of downstream migrating juvenile salmonids, the Walla Walla District is performing an investigation to develop benefits and costs for different alternatives for a permanent installation of a surface passage route at McNary Dam on the Columbia River. The desirable result will be development of a permanent installation that provides the greatest opportunity for improving downstream migration with fewer impacts on power generation, total dissolved gas levels, upstream migrants, navigation system, and the ability to pass flood flows. The surface bypass technology being implemented on the lower Snake River projects is to draw water from the surface using an elevated spillway crest located in a spillway bay. Utilizing a conventional spillway bay has inherit problems of using a spillway and stilling basin that were designed for efficiently passing a high volume of water and dissipating the associated energy. A promising alternative is a centerdam surface bypass (CSB) concept that utilizes an existing non-overflow section of the dam located between the powerhouse and the spillway. The purpose of this paper is to present the opportunities and benefits from developing a flume specific for fish passage that also has the potential of improving the overall objectives for operating McNary Dam. The primary, unique feature is to supply water under the high flow jet that is moving at a high velocity as it enters the tailrace. The feature almost eliminates the undesirable flow entrainment, high-shear zone, and re-circulating eddies in the tailrace that is typical of a high flow bypass.
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Copyright
© 2008 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Bays
- Chemical properties
- Chemistry
- Coastal engineering
- Coasts, oceans, ports, and waterways engineering
- Dams
- Dissolved gases
- Ecosystems
- Environmental engineering
- Fish and fishery management
- Gases
- Geotechnical engineering
- Hydraulic engineering
- Hydraulic structures
- Locks (dam)
- River engineering
- Rivers and streams
- Spillways
- Surface water
- Water (by type)
- Water and water resources
- Water level
- Water management
- Water supply
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