2025-04-14_HYDROLOGY - M1992069 - Laserfiche WebLink

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Holcim South Platte Combined SWSP April 14, 2025 Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, &t 6243 Page 13 of 37 The ditch-wide analysis decreed in case no. 1996CW658 determined the acreage irrigated with GIC water rights was 3,501 acres, or 6.74 acres per share. Of that amount, 2,098 acres were determined to have been dried up as a result of development ("dry-up pool"). The total required dry-up associated with the subject 3 shares is 20.22 acres. Of the 3 GIC shares, 1.5 shares were used to irrigate 2.15 acres identified as Farm E-73a, and the remaining 1.5 shares were used to irrigate 7.06 acres identified as Farm E-73b. The acreage historically irrigated by the subject shares is below the irrigated-acreage-per-share historical average of 6.74. As such, the Applicant may claim the remaining 11 .01 acres of required dry-up from the "dry-up pool". The subject farms are no longer irrigated. In paragraph 6.7.4. of the decree entered in case no. 1996CW658, future farm headgate deliveries of the 67.75 shares owned by Poudre Prairie Irrigation Company were limited to 1,712 acre-feet per year (25.26 acre-feet per share) and 12,631 acre-feet (186.43 acre-feet per share) in any consecutive 10 year period. For the purposes of this one-year SWSP, deliveries of GIC direct flow water associated with the 3 shares must be limited to a farm headgate delivery of 55.8 acre-feet (18.6 acre-feet per share). The historical return flows associated with the 3 shares that are the subject of this SWSP shall be maintained in accordance with the return flow factors identified in case no. 1996CW658. The return flow obligations will be accounted for and replaced under this SWSP. For the purposes of this SWSP, you have used a projected yield of 20.31 acre-feet of GIC direct flow water per share and 1.19 acre-feet of Fossil Creek Reservoir deliveries per share. These amounts are consistent with projected deliveries per share for Year One as described in paragraph 28 of the decree entered in case no. 2003CW348. Projected deliveries for Year One were calculated in accordance with paragraph 20.3.3 of the decree entered in case no. 2003CW99, and are based on 2002-2006 recorded deliveries. As specified in case no. 1996CW658, all GIC direct flow deliveries incur an immediate surface return flow obligation of 23.7%, and all Fossil Creek deliveries incur an immediate surface return flow obligation of 20.1%. The estimated consumptive use credit is therefore 15.50 acre-feet per share for GIC direct flow water, and 0.95 acre-feet per share for Fossil Creek Reservoir water. For the purposes of this SWSP, Holcim is assuming that the GIC's 60 preferred rights in Fossil Creek Reservoir will not be available to GIC during WY2025. Excluding the Fossil Creek Reservoir component of the GIC deliveries, the projected farm headgate delivery of the 3 shares will equal 60.93 acre-feet per year (3 shares x 20.31 acre-feet/share), with a return flow obligation of 27.60 acre-feet. The total consumptive use credit for the 3 shares is therefore projected to equal 33.33 acre-feet for 2025. The GIC shares will be delivered back to the river through the 23rd Avenue and Fourth Street Return Station.