2012-11-20_HYDROLOGY - M1977522 - Laserfiche WebLink

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Mr. Jared Dains, E.I. Feit SWSP November 20, 2012 Page 3 used for dust control. The total operational water loss for WY 2013 is 21.57 acre -feet. The estimated monthly depletions due to operational losses are shown on the attached Table 2. A stream depletion model was used to determine the timing of lagged depletions to the Cache La Poudre River. The following parameters were used in the stream depletion model: transmissivity (T) = 120,000 gallons per day per foot, specific yield (SY) = 0.2 (which is typical for an alluvial aquifer), the distance from the centroid of the exposed ground water to the river = 558 feet, and the location of the parallel impermeable boundary was estimated to be 4,300 feet from the stream. Based on the above factors, the lagged stream depletions for the term of this SWSP were estimated to be 109.08 acre -feet as shown on the attached Table 3. Replacements The sources of replacement water to be used for this SWSP are 1) fully consumable replacement water leased from the City of Aurora, and 2) augmentation water leased from the Graham Drainage Ditch Company. During the period of November 2012 through March 2013, a lease of 22.2 acre -feet of fully consumable water provided by the City of Aurora ( "Aurora ") will be used to make replacements during the non - irrigation season. Aurora confirmed the daily delivery schedule via an October 30, 2012 letter to the Applicant's consultant (attached). 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 Ia 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 Ia Poudre River between the Feit 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 Feit Pit. The Applicant has also obtained a lease from the Graham Drainage Ditch Company for 95.5 acre -feet of replacement water from the Graham Seepage & Drainage Canal (WDID 0301321) water right. 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, executed on September 14, 2012, is for the period of April 2013 through October 2013 and a copy is attached to this letter. Deliveries to the Cache La Poudre are measured at a flume (Graham Seep Ditch Return, WDID 0302906) located approximately 380 feet from the mouth of the ditch and are made downstream of the estimated point of depletions from the Feit Pit, therefore no transit losses were assessed. The monthly depletion and replacement requirements are found on the attached Table 4.