2008-01-14_HYDROLOGY - M2001107 - Laserfiche WebLink

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Rachel Kullman January 8, 2008 Page 2 Depletions The anticipated consumptive use for this plan is 36.81 acre-feet per year for up to 2.73 acres of water surface exposed after December 31, 1980. According to the information submitted, no water surface was exposed within the reclamation permit boundary prior to January 1, 1981. You have provided a monthly breakdown of the maximum annual consumptive use totaling 8.09 acre-feet of evaporative loss from a maximum of 2.73 acres of exposed groundwater, 6.2 acre-feet for dust control, 14.72 acre-feet of water lost with 500,000 tons of mined product, 7.4 acre-feet for concrete production and 0.4 acre-feet for asphalt production. Depletions were lagged to the stream using a Glover analysis and assuming a distance to the stream of 3,300 feet, transmissivity of 150,000 gpd/ft, specific yield of 0.2 and no-flow boundary of 5,000 feet. Replacements The sources of replacement water are 3 shares of Lupton Meadows Ditch Company ("LMDC") and 33.37 acre-feet of fully consumable water leased from Thornton. The 3 shares of LMDC historically irrigated the 11 acres of pasture grass at the NCCI Pit site, shown in attached Figure 2. The LMDC owns shares in several ditch systems including the Lupton Bottom Ditch, Slate Ditch, Meadow Island Ditch #1, Meadow Island Ditch #2 and the Ellwood Right. The amount and source of water available for the LMDC shareholders depends on the physical location of the property under the ditch system. The NCCI property has always been irrigated with only the Lupton Bottom Ditch portion of the LMDC right, therefore, the consumptive use was calculated for the Lupton Bottom Ditch. According to the plan, and based on information from the water commissioner, the first 48 cfs of the Lupton Bottom Ditch diversions benefit all Lupton Bottom shareholders. The LMDC owns 43 shares of the 82.5 shares in the Lupton Bottom ditch, therefore, LMDC receives 52.1 % of the first 48 cfs. The next 10 cfs benefit the Lupton Meadows shareholders. Any amount delivered beyond the first 58 cfs is credited back to the Lupton Bottom shareholders, prorated like the first 48 cfs. Assuming a 10% ditch loss, a 55% irrigation efficiency, and return flows of 20% surface and 80% subsurface, the dry-year consumptive use of the 3 shares of LMDC was determined to be 3.7 acre-feet. The subsurface retum flows were lagged to the stream system using the Glover method. The Applicant assumed a distance of the well to the stream of 3,000 feet, a transmissivity of 150,000 gal/day/ft, a specific yield of 0.2 and a distance to the impermeable boundary of 5,000 feet. The LMDC shares will be returned for augmentation in the summer months through the LMDC East Lateral augmentation station located in Section 13, Township 2 North, Range 67 West. Leased water from Thornton will be used to replace lagged depletions and return flows that are not replaced by the 3 shares of LMDC. The leased water from Thornton will be released from the Metropolitan Wastewater Treatment Plant ("Metro"). A 0.5% per mile transit loss (14% overall loss for the 28 miles between Metro and the point of depletion) was accounted for in the SWSP.