2013-05-29_HYDROLOGY - M1985112 - Laserfiche WebLink

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Mr. Jared Dains, E.I. Loloff SWSP —Amendment #1 May 28, 2013 Page 3 of 6 estimated that a total of 2.77 acre -feet of water will be used for dust control purposes during this plan period. The total evaporative and operational losses during 2013 are 37.28 acre -feet as shown on Table 1. Depletions at the Loloff Pit do not instantaneously accrue to the Cache La Poudre River, but instead result in a lagged depletion. A stream depletion model based on the Stream Depletion Factor (SDF) technique was used to calculate the lagged depletions to the Cache La Poudre River. An SDF of 60 days was used for the Loloff Pit site. The total lagged depletions for this plan period due to both projected and past consumptive use at the site are estimated to be 38.51 acre -feet, as shown on Table 1. Replacement Sources Two replacement sources are proposed to replace depletions from the Loloff Pit. A lease of augmentation water from the City of Aurora will provide replacement water during the non - irrigation season and a lease of augmentation water from the Graham Drainage Ditch Company will supply replacement water during the 2013 irrigation season. A lease of 21.2 acre -feet of fully consumable water provided by the City of Aurora ( "Aurora ") will be used to make replacements during the non - irrigation season of January through March, and November through December 2013. The releases will be made from the Metro Waste Water Reclamation Facility (WDID 0200700) located in Denver on the South Platte River approximately 66 miles upstream from the Cache la Poudre confluence. Therefore a 16.5% (0.25% per mile) river transit loss will be assessed on all deliveries. During the winter it is possible for a call to be placed on the Evans Number 2 ditch for a Milton Reservoir call, or a call at the Western, either of which could potentially sweep the river. It is the Applicants responsibility to track the daily call and make arrangements as necessary to ensure this water is bypassed or otherwise delivered to the Cache la Poudre and South Platte River confluence. The District 3 Water Commissioner has confirmed there is no call in the winter for the stretch of the Cache la Poudre River between the Loloff Pit and the confluence with the South Platter River. Therefore as long as the South Platte River does not sweep, the Aurora lease is able to provide replacement water on behalf of the Loloff Pit. The Applicant has also obtained a lease from the Graham Drainage Ditch Company for 41.9 acre -feet of fully consumable water from the Graham Seepage & Drainage Canal water right (WDID 0301321). This water right was decreed in case no. W -7818 as developed water, not tributary to the South Platte River. The Court found that 2,800 acre -feet of water was developed by the construction, development, and operation of the Graham Seepage & Drainage Canal; however, historically, only 1,330 acre -feet were consumptively used, with 1,470 acre -feet discharged as waste water to the Cache La Poudre River and its tributaries. In the decree entered in case no. W -7818, the Court indicated that it considered the Supreme Court decisions in the cases of Southeastern Colorado Water Conservancy District et al. v. Shelton Farms and Southeastern Colorado Water Conservancy District v. Colorado -New Mexico Land Co., Inc. 187 Colo. 181, 529 P.2d 13212 (1974). Based on the above, this SWSP will only recognize 1,330 acre -feet per year of consumable water. The lease for the Graham Seepage & Drainage Canal water signed on November 8, 2012 and will provide fully consumable water for the period of April 2013 through October 2013 and a copy of the lease is attached to this letter. The fully consumable portion of the water delivered is determined by multiplying measured deliveries by 47.5 %. The lease amounts are for fully consumable water, therefore actual deliveries will include additional water to account for the 47.5% factor. The Graham Seep Ditch deliveries are made approximately 4.3 river miles upstream of the estimated point of depletion of the Loloff Pit, therefore a 0.25% per mile transit loss