A Salmon Population Model for Evaluating Alternative Flow Regimes

by John M. Bartholow, Natl Ecology Research Cent, Ft. Collins, United States,
Terry J. Waddle, (A.M.ASCE), Natl Ecology Research Cent, Ft. Collins, United States,

Document Type: Proceeding Paper

Part of: Water Policy and Management: Solving the Problems


Salmon populations in many Pacific coast rivers are in decline and in danger of becoming threatened or endangered. A fish population model that tracks chinook salmon from eggs to the immature stage has been developed by the U.S. Fish and Wildlife Service for the Trinity River, California. The model considers the environmental factors influencing movement and mortality of young-of-the-year salmon from the time of spawning until they leave the river system. The numbers of salmon produced by managed flow regimes for the river can be estimated using this model. This paper explores the consequences of alternative flow regimes. The model suggests that a managed flow can produce almost the same number of fish as a natural flow pattern, while using less water.

Subject Headings: Hydrologic models | Rivers and streams | High-rise buildings | Fish management | Flow patterns | River flow | Water flow | Wildlife | California | United States

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