University's Civil Engineering Department 

 was utilized for the data measurement and 

 evaluation. 



Leon Verhoeven, Research Assistant 

 Professor, School of Fisheries, and Kingsley 

 V/eber, Fishery Research Biologist, U. S. 

 Fish and Wildlife Sei-vice, Seattle, were 

 most helpful in the conduct of this study. 



Grateful acknowledgment is given the 

 Chelan County, Washington, Public Utility 

 District for supplying funds to cover a 

 portion of this study. 



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101 



