Subordination of the Aspinall Unit Water Rights: 2000 Annual Report

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FROM : UGRWCD FAX NO. : 970 641 7606 Aug. 21 2002 03:53PM P5 3.0 DIVERSIONS AND DEPLETIONS The Division 4 Engineer administered the Upper Gunnison basin with an Aspinall Unit call continuously from November 1, 1999 through October 31, 2000. Therefore, all of the diversions and depletions by upstream water rights junior to the Aspinall Unit qualify for the subordination of Aspinall Unit water rights under the Subordination Agreement. These diversions were summarized, and their associated depletions were calculated, as shown in the columns entitled "Diversions" (column 17) and "Depletions" (column 18) in Appendix A. Only the diversions and depletions associated with the water rights with priorities equal to or junior to the Aspinall Unit water rights are listed. Any depletions and diversions at a structure from water rights with priorities senior to the Aspinall Unit water rights are not shown in Appendix A. ne memoa u>:mizeo is oeiermne ine oiversrons ano oepieuons was a runciron or. 1) trio structure type, 2) the decreed water right uses, and 3) the available data. The procedure used to determine the diversions and depletions for each qualifying water right is described and coded in Table 1 and is cross - referenced in the column entitled "Method" (column 20) in Appendix A. Some water rights have more than one method code because the water right has multiple decreed uses. In these cases, the total diversions and depletions for the right are determined by summing the diversions and depletions associated with each applicable method code shown in the method column. The diversions and depletions calculated using the "codes" shown in the method column are further limited by the decreed water right amounts for those instances where the estimated diversions are greater than the decreed water rights. The method used to determine the diversions and depletions associated with qualifying irrigation water rights was based upon the StateCU computer model developed by the DWR. The diversions for the junior water rights were taken from the column in the StateCU detailed water budget output file entitled "Diversion by Priority - Junior" and the depletions from the column entitled "Estimated Crop CU -By Water Rights - Junior". The basic engineering assumptions used by the DWR in the StateCU model and supporting data sets (see CDSS website) were utilized with the exceptions shown in Table 2. 4.0 SUMMARY The estimates of diversions and depletions contained in this report are derived from information compiled by the Division 4 Engineer. A summary of the water rights, diversions, and depletions that benefit from the Subordination Agreement is presented in Table 3. The following table shows the depletions that occurred from water rights with priorities equal to or junior to the Aspinall Unit priority of November 13, 1957 (administration number 39398.00000) pursuant to the Subordination Agreement, during the period November 1, 1999 through October 31, 2000: River Reach Above Blue Mesa Dam Blue Mesa Dam to Morrow Point Dam Morrow Point Dam to Crystal Dam Total Depletion Allowance acre -feet 40,000 10,000 10,000 60,000 3 2000 Depletions acre -feet 7,126 294 952 8,373 t