C150364 Feasibility Study - Laserfiche WebLink

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WDID # 7905027 for recordkeeping. The Mapes Well No. 1 Decree and well permit are attached in Appendix H. The William Craig Ditch water right has been diverted and applied to about 110 acres, of which approximately 95 acres are located on the Camp Ranch property. Historical diversions under the William Craig Ditch water right have averaged about 365 acre -feet per year. The William Craig Ditch water right (Priority No. 7) is relatively senior. During years of low runoff on the Huerfano River, the William Craig Ditch diversions have averaged about 260 acre -feet per year. The Jose Maria Ditch water right has been diverted at the same headgate as the Pino Ditch water right, as shown in Figure 2. After reviewing the available records, it appears that these waters have been comingled and reported as a single diversion record under the Jose Maria Ditch. The Pino Ditch has three water rights, the first two of which were decreed in the secondary (Killian) decree and the third of which was decreed on October 3, 1921, with an appropriation date of June 14, 1901. Therefore all three Pino rights are junior to the Jose Maria right. A preliminary analysis was conducted in accordance with standard engineering practice to separate out the first 0.24 cfs of the Jose Maria/Pino diversion to identify the diversion attributable to the senior Jose Maria water right. The result of this analysis indicates that average diversions under the Jose Maria right averaged about 37 acre -feet per year. The Jose Maria water right was decreed for irrigation of 12 acres. The one -third interest owned by the Camp Ranch would allow four acres of irrigation. A review of available aerial photos shows much more than four acres irrigated on the Camp Ranch under the Jose Maria Ditch. In our preliminary analysis of historical consumptive use available for transfer to new uses, we limited the irrigated acreage under the Jose Maria right on the Camp Ranch to four acres. A preliminary analysis has been completed by TZA so that we could estimate the historical consumptive use attributable to the Camp Ranch water rights that could be changed for use as consumptive use credits in the regional augmentation plan. This analysis was conducted in the standard manner used for water court transfers. In essence, the crop irrigation requirement was determined and compared to the respective ditch water supply upon the historically irrigated acreage to determine how much of the ditch diversions were consumed, and to determine the amount and timing of return flows. The transferrable historical consumptive use attributable to the use of the William Craig water right on the Camp Ranch was calculated to be approximately 153 acre -feet per year, generally being 1.6 acre feet of consumptive use per irrigated acre. The transferrable historical consumptive use attributable to the use of the Jose Maria water right on the Camp Ranch was calculated to be approximately 6 acre -feet per year. Additional work will be needed to develop firm transferable consumptive use numbers, and to obtain approval to transfer consumptive use credits in water court, but we are confident that the amount of available water will be adequate to meet HCWCD augmentation requirements Historical return flows from irrigation on the Camp Ranch that accrue to the river outside of the irrigation season averaged about 15 acre -feet per year. One method for replacing these return flows will be the construction of a recharge facility on the Camp Ranch and the diversion of some of the Camp Ranch Water Right's diversion entitlement into the recharge facility in order to replicate historical return flows outside the irrigation season and provide replacement water as 0