Table 35 . —Watershed usage factors for water quality prediction! 



1 Values X 10^ except for usage factor. 



2 Mean annual flow for period of record. 



3 Assuming same rate of growth throughout Columbia River Basin 



plus 1950 industrial waste pop. equiv. doubled. 

 1. Using mean annual flow of record. 

 5 Assuming an industrial waste contribution equal to future population. 



Table 36 . —Estimated future water quality characteristics^ 

 Yearly weighted average values 



Conpatad from Tables 35 and 2U. Hhara a 1950 constituent vaa less than the 1910, the 

 1910 value is recorded,, 



2 Total SoUds 



Sample Calculation - Takina River at Kiona i 



Chai«a in usage factor, 1910-1950 • U568| 1950 - Future • 363O1 Alk. change - 29 



^^ " ^^ , X - 23 Future estimated alkaUnity - 82 ♦ 23 • 105 



96 



