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000132 5 Survey Methods Used After considerable discussion with personnel of the Ecological Services Section of the DOW, it was decided to use the Colorado R-2 Cross Method as both the single cross section method and the multiple cross section method of analysis. Up until the present time, this model has been the only method utilized by the DOW to analyze field data in filing for water rights with the Colorado Water Conservation Board under Senate Bill 97. While the R-2 Cross and single cross section methodologies in general have received considerable criti- cism in the past (Bovee and Milhous, 1978), the DOW was not ready to scrap this method in favor of other more sophisticated method- ologies requiring much greater time, manpower, and monetary expense without a comprehensive evaluation. The IFG4 model was used for the Incremental Method of analysis. Results of this analysis were interfaced with the IFG3 model to pro- vide a habitat analysis for target species (trout) occurring in the study reaches. The Tennant (1975) or Mont~a Method was a synthetic analysis of U.S,G.S. flow data and was completed in the office. Field procedures and techniques of data collection are outlined in great detail by Bovee and Milhous (1978). These procedures were followed precisely as described. Criteria For Minimum Flow Determination Minimum levels for key determining parameters with the single transect R-2 Cross Method are presented in Table 3 below. Criteria for the Multiple Transect R-2 Cross and the IFG4 methods on critical riffles were the same as those for the single transect R-2 Cross. But in run and pool type habitat, both water velocity and average depth respond differently when compared to critical riffle environments. Therefore, minimum average depth and velocity criteria in run and pool type transects were modified as shown in Table 3-A, below. , l