2024-06-18_HYDROLOGY - M1977436 - Laserfiche WebLink

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Holcim South Platte Combined SWSP June 18, 2024 Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, &t 6243 Page 8 of 26 determined to be 4,270.4 acre-feet, or 13.69 acre-feet per share. For Holcim's 13.5 Whitney Ditch shares, the total average annual consumptive use would therefore equal 184.81 acre-feet per year. The ditch-wide analysis utilized a return flow split of 50% surface and 50% subsurface return flows. For the 2024 plan period, Holcim will dedicate all 13.5 of their Whitney Ditch shares to this SWSP. For the purposes of this SWSP, the projected farm headgate delivery has been estimated from a requested delivery of 17.04 acre-feet per share or 230 acre-feet for all 13.5 shares, which is less than a dry-year farm headgate delivery of 24.75 acre-feet per share (which includes a 15% ditch loss) or approximately 334 acre-feet for all 13.5 shares. After accounting for the return flow obligations, the total consumptive use credit for 2024 is projected to be approximately 109.49 acre-feet. Holcim will utilize the Whitney Ditch West return structure (WDID 0302904) owned by the Whitney Irrigation Company located in the SE'/a of Section 30, Township 6 North, Range 66 West, 6th P.M. to return the water attributable to their Whitney Ditch shares to the Cache la Poudre River. This source may not be used until the Applicant has provided an executed agreement authorizing Aggregate's use of this structure for the 2024 irrigation season. The location of the historically irrigated land to be dried up for the subject Whitney Ditch shares was originally identified through an April 12, 2011 letter to the Division 1 Engineer. That letter stated the northern portion of Orr Farm #1 may continue to be irrigated using 1 of the 13.5 Whitney Ditch shares owned by the Applicant. In 2011 the entire Orr Farm #1 was removed from irrigation due to damage to the lateral serving the property. Therefore the entire farm is included as dry-up for all 13.5 shares dedicated to the plan in 2024. The share dedication dated February 29, 2012 remains valid and is attached. Greeley Irrigation Company Shares The Applicant has obtained a lease for a total of three (3) shares in the Greeley Irrigation Company ("GIC") owned by Pat Arnold. A share of GIC water provides the shareholder with GIC direct flow water and Fossil Creek Reservoir water. The term of the lease is for the 2024 irrigation season. A copy of the lease, dated January 2, 2024, is attached. The share certificate numbers are #2476 (2 shares) and #2455 (1 share). The GIC owns a 5/8th interest in the water rights decreed to the Greeley Canal No. 3 (WDID 0300934) and 60 preferred rights in Fossil Creek Reservoir (WDID 0303774). The historical use of 519.7 outstanding shares in the GIC was previously quantified and decreed in case no. 1996CW658 using a ditch-wide analysis. The decree in case no. 1996CW658 found that 519.7 shares were used to irrigate 3,501 acres (6.74 acres per share) with an average historical consumptive use of 5,358 acre-feet per year, which yields an average consumptive use credit of 10.31 acre-feet per share (5,358 acre-feet : 519.7 shares) or an average consumptive use credit of 1.53 acre-feet per acre. The 3 GIC shares leased by the Applicant are therefore expected to yield a consumptive use amount of 30.93 acre-feet per year (10.31 acre-feet/share x 3 shares = 30.93 acre-feet). 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.