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Table 2 <br />Modifications to the DWR StateCU Model <br />Item <br />Original Value <br />Revised Value <br />Explanation <br />Maximum <br />0.5 <br />0.4 <br />Average ditch loss of 20 percent and maximum farm <br />System <br />efficiency of 50 percent for a system efficiency of 40 <br />Efficiency <br />percent (0.84.5) are more reasonable for the Upper <br />Gunnison basin considering the shallow soil types. <br />Grass Hay Crop <br />Values from "Irrigation Water <br />Values from "Water Use by <br />The TR -21 crop coefficients are not reasonable given <br />Coefficients <br />Requirement TR -21 ", USDA, April <br />Native Grasses in High Altitude <br />the low nighttime temperatures in the Upper Gunnison <br />1967 <br />Colorado Meadows ", USDA, <br />basin. <br />October 1973 <br />Missing <br />Option to set = 0.0 or use "Pro- <br />"Pro- rated" Method. <br />Diversions estimated based on crop water requirement <br />Diversions <br />rated" method <br />shortage. Shortage at structure estimated to be the <br />Records <br />same as average shortage- for structures with <br />diversions within the same water district. See StateCU <br />documentation for further details. <br />Irrigated Acreage <br />Values within the HYDROBASE as <br />Values identified and mapped <br />Irrigated acreage values per structure were revised by <br />identified and mapped in 1993 by <br />in 2000 by the DWR. <br />the DWR based on parcels identified in 2000. These <br />the DWR as part of the Colorado <br />values have not been entered into the HYDROBASE <br />Decision Support System. <br />database, therefore the irrigated acreage input to <br />StateCU were modified to reflect the revised values. <br />Helton & Williamsen, P.C. Page 8 2001 Annual Report.xls, Table 2, 12/18/2002, rlh <br />