HATCHERY OPERA IIONS 



69 



Table 8. flow index related to water temperature and elevation for 

 trout and salmon, based on an optimum index of f = 1.3 at .'>0°f and '),000 

 feet elevation. oxygen concentration is assumed to be at or near 100% 

 saturation. (source: bruce b. cannady, unpublished.) 



(1) The Flow Index [F] is 1.30 (Table 8, 4,000 feet elevation, 55°F tem- 

 perature). 



(2) We can now estimate the permissible weight of trout that can be held 

 per gallon per minute, by the formula W = F >^ L x /, where F=1.30, 

 L = A inches, and / = 1 gallon per minute. Approximately 5.2 pounds of 

 trout can be safely reared per gallon per minute water inflow (l.SO x 4 x l). 



The effect of water temperature on the Flow Index can readily be seen in 

 the table. For instance, a hatchery at a 5,000- foot elevation having a water 



