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Jared Dains <br />South Platte Combined Replacement Plan <br />April 2, 2009 <br />Page 9 <br />Thornton Lease <br />Aggregate has leased 10.53 acre-feet of fully consumable effluent from the City of Thornton, which <br />will be released from the Metro Wastewater Treatment Plant. <br />Fulton Ditch <br />The historic use of the 96 Fulton ditch shares yields 235.88 acre-feet of water during April through <br />September while generating 67.75 acre-feet of return flow obligation during October through <br />March.. This quantification is based on the technique used in the March 24, 1999 approval for the <br />Fulton Lakes Pit, where the historic consumptive use values were determined using an analysis <br />decreed in case number 82CW393. In this approach, headgate diversions were based on average <br />monthly values for the period of 1976-1988 and a 10% conveyance loss was assumed as well as a <br />farm efficiency of 50%. The return flow obligations, which were not addressed in the above <br />decree, were calculated for this plan using a SDF value of 270 days and the assumption that all <br />water diverted but not used by the crops is returned to the stream system through deep <br />percolation. <br />Brighton Ditch <br />The 1.323 shares of Brighton ditch were historically used to irrigate the three farms described <br />below: <br />The 4/14th share were historically used to irrigate 64.9 acres of pasture grass at the Getz Farm. <br />Using a Blaney-Criddle analysis the potential crop consumptive use for the 64.9 acres was <br />determined to be 106.53 acre-feet. Assuming a 30% ditch loss and 55% farm efficiency the dry <br />year consumptive use was determined to be 44 acre-feet. <br />The 4/6th share was historically used to irrigate 40.4 acres at the Wattenberg Property consisting of <br />50% pasture grass and 50% alfalfa. Using a Blaney-Criddle analysis the potential crop <br />consumptive use for the 40.4 acres was determined to be 73.23 acre-feet. Assuming a 30% ditch <br />loss and 55% farm efficiency the dry year consumptive use was determined to be 72.2 acre-feet. <br />The 0.371 shares were historically used to irrigate 72.1 acres at the Haake Property along with <br />5.75 shares of New Branter Ditch. The property consists of 50% pasture grass and 50% alfalfa. <br />Using a Blaney-Criddle analysis the potential crop consumptive use for the 72.1 acres was <br />determined to be 130.75 acre-feet. Assuming a 30% ditch loss and 55% farm efficiency the dry <br />year consumptive use for the 0.371 Brighton ditch shares was determined to be 46.5 acre-feet. <br />Aggregate will utilize the entire 1.323 shares for use in this plan. <br />Dewatering Credit <br />The applicant will account for the depletions and accretions to the river that results from <br />dewatering operations. Prior to claiming any credit for the water returned to the stream system <br />from dewatering the applicant must install adequate measuring device to measure the quantity of <br />water being pumped for dewatering purposes. <br />The proposed depletions and replacements are shown in the attached Division 1 Water <br />Accounting Summary.