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that the amount of irrigated area ( 216 acres) may be overstated, particularly since the ditch is decreed for <br />only 1.22 cfs. If the data is correct, the USBR cutoffs are not appropriate for this ditch. <br />TABLE 3 <br />RATIO OF CONSUMPTIVE USE TO DIVERSION <br />IN YEARS THE WATER SUPPLY LIMITS CROP CONSUMPTIVE USE <br />SELECT DITCHES IN THE UNCOMPAHGRE RIVER BASIN <br />RATIO OF CONSUMPTIVE USE <br />TO DIVERSIONS <br />DITCHYEARMAYJUNJULAUG <br />Boles and Manney Ditches19870.030.120.220.66 <br />Beach Nos. 1, 2 and 3 Ditches 19870.150.360.441.12 <br />19880.100.370.720.63 <br />19890.151.20No Div.No Div. <br />19900.110.461.22No Div. <br />Spring Ditch19870.140.410.43No Div. <br />19880.190.581.170.44 <br />19890.360.56No Div.No Div. <br />19900.160.320.423.03 <br />Eagle Ditch19870.140.290.740.54 <br />19880.130.370.870.82 <br />19900.160.370.500.99 <br />JH Anderson Ditch19850.261.101.201.95 <br />19860.140.720.930.79 <br />19870.351.021.382.52 <br />19880.230.891.6518.5 <br />19891.15No Div.No Div.No Div. <br />19900.190.581.075.88 <br />Shavano Valley Ditch19851.08.0022.49No Div. <br />19860.564.745.45 <br />19870.7065.5No Div.No Div. <br />19885.0312.72No Div.No Div. <br />198911.0No Div.No Div.No Div. <br />19903.39No Div.No Div.No Div. <br />The Shavano Valley Ditch was found to be water-short in every year of the study period. The ditch diverts <br />from Spring Creek and has two water rights (7.81 cfs, Admin.number = 12744; and 5.94 cfs, Admin.number <br />= 29038.2748). Its senior right is the N o. 7 priority on Spring Creek. Even so, the ditch did not divert in <br />July, August, and September in 4 of the 6 years of the study period. The water supply is probably limited <br />by physical availability in this tribut ary stream. The USBR cutoff dates could not be applied to this ditch. <br />For this analysis, the availability of data limited the investigation. Most of the ditches identified by the <br />State could not be used because they were not wate r-short or their data were incomplete. The analysis <br />completed on the six ditches that were analyzed is se nsitive to the input data used to derive the consumptive <br />use and the diversions. If the consumptive use is overstated because the SCS modified Blaney-Criddle <br />overestimates crop consumptive use or if the irrigated area is less than the value used, ditches that have <br />appeared to be water-short may, in fact, not be. If th e opposite is true, i.e., either the SCS Blaney-Criddle <br />6 <br />A 275 01.09.95 1.14-24 Walter <br />