Figure 3. Weighted usable area-discharge relationships 

 derived from the IFG incremental method for 

 adult brown and rainbow trout in reach #1 of 

 the Big Hole River using both the mean and 

 bottom velocities in the water column. 



5 

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a 



H 

 (/I 



< U. 

 ^ O 



< 2 



y 8 



CD Q 

 < 



(/) cr 



<5 o 



y CO 



z 

 < 



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o 



I 



20 



15 



ADULT BROWN TROUT 



—I 1 I I I ■ I ' I 



5 10 15 20 25 



30 



25 



20 



15 



10 



DISCHARGE (M7S) 



ADULT RAINBOW TROUT 



10 



15 



• I — 

 20 



I I I 

 25 30 



DISCHARGE (M/'S) 



