2009-12-22_HYDROLOGY - M1977436 - Laserfiche WebLink

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Jared Dains South Platte Combined Replacement Plan December 21, 2009 Page 10 0 Brighton Ditch The 1.323 shares of Brighton ditch were historically used to irrigate the three farms described below: The 4/14'" share were historically used to irrigate 64.9 acres of pasture grass at the Getz Farm. Using a Blaney - Criddle analysis the potential crop consumptive use for the 64.9 acres was determined to be 106.53 acre -feet. Assuming a 30% ditch loss and 55% farm efficiency the dry year consumptive use was determined to be 44 acre -feet. The 4/6` share was historically used to irrigate 40.4 acres at the Wattenberg Property consisting of 50% pasture grass and 50% alfalfa. Using a Blaney - Criddle analysis the potential crop consumptive use for the 40.4 acres was determined to be 73.23 acre -feet. Assuming a 30% ditch loss and 55% farm efficiency the dry year consumptive use was determined to be 72.2 acre -feet. The 0.371 shares were historically used to irrigate 72.1 acres at the Haake Property along with 5.75 shares of New Branter Ditch. The property consists of 50% pasture grass and 50% alfalfa. Using a Blaney - Criddle analysis the potential crop consumptive use for the 72.1 acres was determined to be 130.75 acre -feet. Assuming a 30% ditch loss and 55% farm efficiency the dry year consumptive use for the 0.371 Brighton ditch shares was determined to be 46.5 acre -feet. Aggregate will utilize.the entire 1.323 shares for use in this plan. For 2010 the expected consumptive use credit for the 1.323 Brighton Ditch shares has been estimated from a dry-up farm headgate delivery of 283 acre -feet per share (which include the 30% ditch loss) or approximately 374 acre -feet for all 1.323 Brighton Ditch shares. After accounting for the return flow obligations the total consumptive use credit for 2010 is projected to be approximately 196.01 acre -feet. This value is greater that the estimated dry-year yield because Aggregate owns lower than normal return flows in 2010 due to the small volume of deliveries made in 2009 (only approximately 254 acre -feet were delivered in 2009). Old Brantner Ditch Aggregate current has use of 11 shares of Old Brantner Ditch, however they do not propose to utilize those shares in this plan. Dewatering Credit The applicant will account for the depletions and accretions to the river that results from dewatering operations. Prior to claiming any credit for the water returned to the stream system from dewatering the applicant must install adequate measuring device to measure the quantity of water being pumped for dewatering purposes. According to an affidavit dated December 10, 2009, the Applicant dedicated the 12.5 shares of the Whitney Ditch Company, 100% of the Coffin & Davis Ditch, 96 shares of the Fulton Irrigating Ditch Company, 240 shares of the Boyd and Freeman Ditch Company, and 1.323 shares in the Brighton Ditch Company as replacement water solely to this SWSP for the 2010 irrigation season. A copy of the affidavit is attached to this letter. The proposed depletions and replacements are shown in the attached Division 1 Water Accounting Summary.