Page 



The effect of impoundment on water quality 30 



Effect on physical and chemical water quality 30 



Effect on the biological water quality 32 



Summary 32 



Acknowledgment 34 



Literature cited 34 



LIST OF FIGURES 

 No. Page 



1 Wenatchee River Basin (location map) 2 



2 Vilenatchee River Basin (map) 3 



3 Hydrograph, Wenatchee River at Peshastin, Washington. 



Average for period 1929-1953. Drainage area 



1,000 sq. mi 3 



4 Hydrograph, Chiwawa River near Plain, Washington. 



Average for period 1936-1950. Drainage area 



170 sq. mi 3 



5 Relation between stream flow, precipitation and air 



temperature, Wenatchee River at Plain, Washington , 4 



6 Wenatchee River Basin sampling stations (location map) . 9 



7 Photographs of ssuapling stations 10 



8 Physical and chemical characteristics, Nason Creek ... 12 



9 Physical and chemical characteristics, Nason Creek, 



Station 1 13 



10 Physical and chemical characteristics, Chiwawa River, 



Station 2 15 



11 Characteristics, Chiwawa River, Station 2 16 



12 Lake Wenatchee 18 



