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Holcim South Platte Combined SWSP April 14, 2025 <br /> Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, Ft 6243 Page 11 of 37 <br /> Replacements <br /> Lower Poudre River <br /> Projected <br /> Replacement Sources 2025 Yield Comments <br /> (acre-feet) <br /> Whitney Ditch 112.04 13.5 shares <br /> Greeley Irrigation Company 33.33 Lease of 3 shares <br /> Bucklen Pit 70.70 Annual lease of excess augmentation credit <br /> City of Greeley 36 Lease <br /> Note: Projected 2025 yield may vary from previous estimates of net yields due to the <br /> computed return flow obligations based on the previous year's actual water deliveries. <br /> Whitney Ditch <br /> Holcim owns a total of 13.5 shares in the Whitney Ditch Company. The subject 13.5 shares <br /> were changed in case no. 1990CW23 from irrigation use to industrial mining, dust <br /> suppression, reclamation, irrigation, augmentation under the plan for augmentation <br /> described in the decree, and piscatorial purposes. The use of the subject shares for <br /> replacement purposes in this SWSP was not decreed in case no. 1990CW23; however, the <br /> Applicant has proposed to use the subject shares for replacement purposes pursuant to this <br /> SWSP in conformity with the requirements of case no. 1990CW23. <br /> The decree entered in case no. 1990CW23 relied on a ditch-wide analysis of the Whitney <br /> Ditch developed for and decreed in case no. 2008CW65. Based on a study period of 1950 <br /> through 1995, the Court found that the average annual gross river diversion was 10,600.2 <br /> acre-feet per year or 33.13 acre-feet per share. The ditch-wide analysis determined that the <br /> overall average consumptive use was 4,400.9 acre-feet per year or 13.75 acre-feet per share <br /> for 320 shares, assuming a system loss of 15% and a farm efficiency of 60%. In case no. <br /> 2002CW331, 8 shares historically used on 74 acres were found to have a river headgate <br /> diversion of 33.42 acre-feet per share and a consumptive use of 16.32 acre-feet per share <br /> (130.5 acre-feet total). After removing the consumptive use decreed for the 8 shares in case <br /> no. 2002CW331, the historical consumptive use for the remaining 312 shares was determined <br /> to be 4,270.4 acre-feet, or 13.69 acre-feet per share. For Holcim's 13.5 Whitney Ditch <br /> shares, the total average annual consumptive use would therefore equal 184.81 acre-feet <br /> per year. The ditch-wide analysis utilized a return flow split of 50% surface and 50% <br /> subsurface return flows. <br />