2014-03-19_HYDROLOGY - M1996049 - Laserfiche WebLink

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Mr. Raul Passerini, P.E. Page 6 March 19, 2014 This junior water right in the McKay Ditch (appropriation October 1, 1926) was historically called out by the Shoshone water right. Historically the water rights within the Colorado River Basin that are junior to the Shoshone water right have been allowed to divert without curtailment because of releases of water from the HUP in Green Mountain Reservoir. Once the junior water in the McKay Ditch is changed for augmentation purposes it will no longer benefit from the Green Mountain Reservoir releases under the HUP. Therefore, for the purpose of this analysis, and based on the historical call of the Shoshone water right, it was assumed that the McKay Ditch was out -of- priority beginning July 1 of each year, and no historical consumptive use credits for the Mc Kay Ditch were used for the period of July- November of each year during the study period. The historical consumptive use from the water right in the McKay Ditch for the 66.2 acres was estimated to be approximately 43.36 acre -feet, as shown on the attached Table 7 or 0.65 acre -feet per acre. The irrigation consumptive use credits resulting from the dry-up of 138 acres totals 111.3 acre -feet. Historical return flows from irrigation on this site are to be maintained by continuing diversions through the Famine Ditch, the Old Whetstone Sheep Creek Ditch, the South Rock Creek Ditch, and the McKay Ditch. Please note that approval of these credits does not imply a position by this office in any subsequent change of water right or other litigation for these water rights. In addition, note that a comprehensive stream depletion analysis considering return flow lags may be necessary for approval of a plan for augmentation. Replacement water to offset depletions during the non - irrigation season is to be provided by releases from storage from Green Mountain Reservoir and Dillon Reservoir. The schedule of releases from storage is outlined in the attached Tables 9 and 10. For 2013, releases from Green Mountain Reservoir are to total 15.63 acre -feet from an existing contract with the U.S. Bureau of Reclamation (Bureau), which has not already been committed to the augmentation plan filed in Case No. 96CW176. An additional 30.0 acre -feet are to be released pursuant to the amended contract with the Bureau for a total release from Green Mountain Reservoir of 45.63 acre -feet of water. For 2014, releases from Green Mountain Reservoir are to total 15.63 acre -feet from an existing contract with the Bureau, which has not already been committed to the augmentation plan filed in Case No. 96CW176. An additional 30.89 acre -feet are to be released pursuant to the amended contract with the Bureau for a total release from Green Mountain Reservoir of 46.52 acre -feet of water. A total of 3.3 acre -feet are available for release from Dillon Reservoir pursuant to an agreement with the Board of Commissioners of Summit County. (A total of 4.3 acre -feet are included in the contract; however, one acre -foot is dedicated to the operation of the augmentation plan decreed in Case No. 96CW176, leaving 3.3 acre -feet available for use in this SWSP.) For 2013 and 2014, no releases are to be made from Dillon Reservoir for this SWSP. Conditions of Approval hereby approve the proposed SWSP in accordance with § 37 -90- 137(11), C.R.S., subject to the following conditions: 1. This SWSP shall be valid from May 9, 2013 through December 31, 2014 unless otherwise revoked or modified. If this SWSP will not be made absolute by a water court action by the SWSP expiration date, a renewal request must be submitted to this office with the statutory fee (currently $257) no later than November 15, 2014. 2. Well permit, Permit No. 48230 -F, has been obtained for an exposed pond surface area of 13 acres and limited operational losses. Since the exposed surface area at the site is now 30.7 acres and the operational losses at the site have expanded a new well permit must be issued for the gravel pit in accordance with § 37 -90- 137(2) and (11), C.R.S. A well