IFG Incremental Method 



The IFG incremental method was applied to the five river 

 reaches according to the procedures prescribed in Bovee and 

 Cochnauer (1977), Bovee (1978) and Main (1978 and 1978a). The 

 habitat in each of the subreaches was described using from 

 five to seven cross-sections. The model was calibrated to 

 field data collected at the following flows: 



■>/ 



Subreach 



Madison (#1) 



Madison (#3) 

 Beaverhead (#2) 

 Gallatin (#2) 

 Big Hole (#1) 



Cross-section # 



Calibration Flows (cfs) 



985 



The IFG-4 hydraulic simulation program and the probability-of- 

 use curves developed by the IFG were employed in the applica- 

 tion of this method. 



. - r 



-i P, 





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