2011-05-13_HYDROLOGY - M1977439 - Laserfiche WebLink

Home Browse Search

Mr. Jared Dains May 11, 2011 Replacement Page 4 Replacements for this combined plan will come from the following sources: accretion credits from recharge of 5.75 Taylor and Gill Ditch shares, and leased water from Tri-Districts, Platte River Power Authority, City of Greeley and the Lake Canal and Reservoir Company will make additional replacements for the months with insufficient recharge accretion credits. The 5.75 Taylor and Gill Ditch shares will be diverted into a recharge pit located on the Home Office site. The evaporation losses from the recharge pond during this approval period are estimated at 2.58 acre-feet (see attached Table 5). In 2006, 2007, 2008, 2009, and 2010 the 5.75 Taylor and Gill Ditch shares were diverted into the recharge pond to produce accretions to the stream for replacement purposes. The 5.75 shares will be diverted in the recharge pond again in 2011 to provide replacement water for this combined plan. The 5.75 shares were historically used to irrigate 104.5 acres of pasture grass, all of which have been taken out of production. The historical consumptive use of the 5.75 shares was determined to be 122.8 acre-feet (includes consumptive use and return flows). The 5.75 shares will be diverted into the recharge pit each irrigation season. The applicant is required to maintain the return flow obligations from the changed use of the 5.75 shares of the Taylor and Gill Ditch as described in this plan. The attached Table 3 shows the farm headgate delivery of 5.75 Taylor and Gill Ditch shares. Lafarge West, Inc. ("Lafarge") plans to divert the full farm headgate delivery of 240.31 acre-feet into the recharge site each year. A total of 171.04 acre-feet were diverted into the recharge site between April 21 and September 1, 2010 (Table 4). Because of the small volume of recharge in 2010, Lafarge had a shortfall of 56 acre-feet from July 2010 through September 2010. Therefore additional leases of 25.00 acre-feet from Tri-District, 15 acre-feet (including 7.8 percent transit losses) from the City of Fort Collins and 25 acre-feet from the Lake Canal Reservoir Company made additional replacements during the 2010 water year. A copy of the water leases with the Tri-District, City of Fort Collins, and Lake Canal Reservoir Company were submitted to this office with this SWSP request. Lafarge will divert the full farm headgate delivery of the 5.75 Taylor and Gill Ditch shares starting in April 2011. Accordingly, the monthly timing of 240.32 acre-feet (full farm headgate delivery of the 5.75 shares) was used in the recharge model to determine the recharge accretion credits for 2011. The lagged accretions to the Cache la Poudre River are estimated to total 248.42 acre-feet for this approval period (includes carry over from recharge in previous years). During the months of May and June 2011, recharge accretions are insufficient to replace all lagged stream depletions, thus you have indicated that a lease from the Tri-Districts was obtained for additional replacement credits. The total amount of water required (including 7.8 percent transit losses) is 69.80 acre-feet. A copy of the lease with the Tri-Districts dated November 30, 2010 was provided to this office and is attached to this letter. Also, for the months of November 2010, March, April and November 2011, a lease of 42.20 acre-feet of fully consumable water provided by the Platte River Power Authority ("PRPA") will be used to make replacements. PRPA has an "Agreement for the Reuse of Water for Energy Generation", dated August 10, 1978, with the City of Fort Collins ("Fort Collins") and Water Supply and Storage Company ("WSSC") that provides PRPA with the right to receive reusable water delivered by Fort Collins. PRPA, Fort Collins, and WSSC also obtained approval of a plan for augmentation including reuse of water in Division 1 Water Court Case no. W-9332-78. In case no.