can dilute oxygen-demanding or toxic wastes. Butts et al. (1975) 

 report that increased flows in the upper Illinois River initially 

 result in reduced dissolved oxygen levels because combined storm and 

 sanitary sewers overflow to the river, but that during sustained 

 high flows, the oxygen levels are higher than during sustained low flows. 



Figure 7 shows that the catch of largemouth bass, a representative 

 game species, has declined in the Alton Pool since the high water years 

 of 1973-74. 



102 



