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The ditches analyzed in this investigation were selected from a list of 60 ditches for which the irrigated area <br />and crop distribution was provi ded by the State. To shorten the list of ditches to a workable number of 4 to <br />7 ditches, the following criteria were used: <br />The actual consumptive use values provided by CS U-IDS were tabulated monthly values in units <br />? <br />of 1,000 acre-feet to two decimal places (e.g. 1.00 = 1000 acre-feet, 0.01 = 10 acre-feet); <br />therefore, ditches with very small irrigated acr eages would be very sensitive to rounding to the <br />nearest 10 acre-feet. Thus, ditches with sma ll acreages were not considered for analysis. <br /> <br />Any ditch with a considerable amount of undefined irrigated acreage was excluded. <br />? <br /> <br />If a ditch did not irrigate alfalfa a nd/or pasture grass, it was excluded. <br />? <br /> <br />Any ditch for which diversion data were not available was excluded. <br />? <br /> <br />Any ditch for which consumptive use data were not available was excluded. <br />? <br /> <br />Any ditch that received a considerable amount of reservoir or project water was excluded. <br />? <br />3.0 CONCLUSIONS AND RECOMMENDATIONS <br />Cutoff Dates, 1985 - 1990 <br />Using the USBR's recommended flow ra tes shown in Table 1, the actual cutoff dates for alfalfa and pasture <br />grass for 1985 through 1990 in the Gunnis on River basin were determined us ing streamflow records at the <br />three stream gaging stations. The results of this analysis are shown in Table 2. <br />TABLE 2 <br />CUTOFF DATES FOR STREAM GAGING STATIONS <br />(GUNNISON RIVER BASIN ONLY) <br />CUTOFF <br />FLOWYEAR <br />STREAM-GAGECROPRATE198519861987198819891990 <br />Smith Fork Alfalfa12 cfs7/268/17/227/127/5 <br />near Crawford <br />Pasture Grass13 cfs7/257/317/217/117/57/21 <br />Gunnison River Alfalfa7308/910/17/257/147/37/12 <br />near Gunnison <br />Pasture Grass8008/89/227/157/106/307/3 <br />Pasture Grass8708/79/77/147/95/66/30 <br />Uncompahgre R. Alfalfa3208/77/307/226/86/206/30 <br />at Colona <br />Pasture Grass6507/157/157/2Max q Max q 6/16 <br />=518 cfs =322 cfs <br />3 <br />A 275 01.09.95 1.14-24 Walter <br />