The wetted perimeter curves for four of. -the five reaches 

 were derived using the "Pseudo" or Water Surface Profile (WSP) 

 hydraulic simulation computer program developed by the Bureau 

 of Reclamation. The VJSP model was applied to the four river 

 reaches according to procedures prescribed in Spence (1975) . 

 The model was not applied to reach #3 of the Madison River. 

 The wetted perimeter curve for the composite of cross-sections 

 in this reach was derived using the IFG-4 model which was 

 calibrated to field data collected at flows of 918, 1,211 and 

 1,555 cfs. Field data for the WSP model were collected at the 

 following single flows: 



Subreach 



Cross-section # 



Calibration Flows (cfs) 



Madison (#1) 

 Beaverhead (#2) 

 Gallatin (#2) 

 Big Hole (#1) 



1 through 5 

 1 through 4 

 1 through 7 

 1 through 6 



1,339 

 343 

 646 

 985 



Mr. Rick DeVore of 

 calibrated the WSP 

 cal assistance. 



the Bureau of Reclamation, Billings, Montana, 

 model to the field data and provided techni- 



Non-field Method 



The non-field method selected for evaluation was the 

 Tennant or Montana method developed by Donald L. Tennant of 

 the U.S. Fish and Wildlife Service, Billings, Montana (Ten- 

 nant, 1975) . Flow recommendations are based on a percentage 

 of the mean flow of record. The method is described as follows 



I* 



"Tennant or Montana Method" for prescribing Instream 



Flow Regimens for Fish, Wildlife, Recreation and Re- 

 lated Environmental Resources (from Tennant, 19 75) . 



Narrative Description 

 of Flows 



Recommended Base Flow Regimens 

 Oct-Mar : Apr-Sept 



Flushing or Max. 



Optimum Range 



Outstanding 



Excellent 



Good 



Fair or Degrading 



Poor or Minimum 



Severe Degradation 



200% of the average flow 

 60%-100% of the average flow 

 40% 60% 



30% 50% 



20% 40% 



10% 30% 



10% 10% 



10% of average flow to flow 



