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Jared Dains <br />South Platte Combined Replacement Plan <br />March 21, 2011 <br />Page 11 <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 in the previous plan using a SDF value of 270 days and the assumption <br />that all water diverted but not used by the crops is returned to the stream system through deep <br />percolation. <br />The expected consumptive use credit for the 96 Fulton Ditch shares for 2011 has been estimated <br />from a dry-up farm headgate delivery of 3.50 acre-feet per share or approximately 336 acre-feet for <br />the 96 Fulton Ditch shares. Because there is no immediate surface component the return flow <br />obligations were calculated as a percentage of the previous year farm headgate delivery. In 2010, <br />Aggregate delivered only 188 acre-feet of the Fulton Ditch shares because the full yield of the <br />water right was not needed to meet the replacement obligations. The total consumptive use credit <br />in 2011 is projected to equal 242 acre-feet, which is greater than the dry-year yield because of the <br />reduced subsurface return flow obligation requirement resulting from low deliveries in 2010. <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 />According to the information provided on March 16, 2011, Aggregate will not be able to use the <br />1.323 Brighton Ditch shares in 2011 as replacement water source, however Aggregate will make <br />replacements for the return flow obligation for the water that was delivered in 2010. <br />Old Brantner Ditch <br />Aggregate current has use of 11 shares of Old Brantner Ditch, however they do not propose to <br />utilize those shares in this plan. <br />Dewatering Credit <br />The applicant will account for the depletions and accretions to the river that resulted from <br />dewatering operations. Prior to claiming any credit for the water returned to the stream system