Thermal Stratification and Reservoir Outlets 35 



LATE 



SPRING 



cold 

 tailwater 



warm, oxygenated 



fish producing zone 



cool, transitional zone 



cold, oxygenated 

 supports fish 



LATE 



SUMMER 



cold 

 tailwater 



lower water level 



warm, oxygenated 



fish producing zone 



cool, transitional zone 



cold, oxygenated 

 supports fish 



oxygen supply decreasing 

 deficient for fish 



Figure 2.6. Storage reservoirs with deep water outlets. A water-release pro- 

 gram that will furnish an adequate quantity of water cold enough for a year- 

 round trout stream often supplies very fine fishing. However, trout must be 

 stocked from hatcheries, as tailwater streams usually are not suitable for nat- 

 ural spawnings. [Redrawn from Stroud, R. H., and Jenkins, R. M., Sport Fish- 

 ing Inst. Bull, 9S (I960)] 



