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I' ~'! .~, .., ., n '-' -_I '"I .. -J;J .. Table 4 Difference file derivation 1/ (Gunnison River above Gunnison River near Gunnison) Station Filename Gunnison River near VI14500 [Base] Gunnison Ohio Creek near Gunnison - VG14000 East River at Almont - VG12500 Taylor River at AImont 1/ - = minus - VCI0000 The difference file resulting from subtraction of these files is presented in Table 5, it shows an average annual difference of -20,800 acre-feet. Fifty-seven percent (219) of the monthly values in Table 5 are negative. More than 25 percent (97) of these values diverge by more than 10 percent of the Gunnison River near Gunnison flows. ;~ Virgin flow estimates for the Gunnison River near Gunnison (VI14500) were derived by adding estimated irrigation consumptive use depletions to gaged historic flows at this site. Flows were further adjusted for Taylor Reservoir chang'es in storage. Flows for the East River at AImont (VG12500) were developed by adjusting historic gaged flows at the site for irrigation consumptive use depletions. Virgin flow estimates for the Taylor River at Almont (VCI0000) were derived by adjusting historic gaged flows at this site for changes in storage in Taylor Park Reservoir. (Irrigation depletion above this site was considered negligible.) Flow estimates of Ohio Creek near Gunnison (VG14000) were derived by correlation with East River at Almont flows. (Historic flows for Ohio Creek near Gunnison are available for water years 1945-1950.) More detailed discussion of virg in flow derivation at these stations is given in Appendix C. 11 :~tj; 'i~J~j {f~1~:;