2024-09-09_REVISION - M1981058 - Laserfiche WebLink

Home Browse Search

Findings of Fact,Conclusions of Law,Ruling of the Referee and Decree of the Water Court Thomas F.and Ginger L.Latham 23CW3022 Page 5 iv. Source: Colorado River. v. Appropriation Date: December 1, 1950. vi. Amount: 12.5 cfs vii. Decreed and Historic Use: Irrigation. 15. Description of the Changes Sought and Statement of Plan for Augmentation: A. Historical Diversions: Diversion records for the Larkin Ditch are available from DWR's CDSS website for the period 1972 through 2022. The Applicants propose the use of historical irrigation credits associated with the dry-up of nine acres of historically irrigated lands permanently retired from irrigation as a result of the mining to offset potential out of priority depletions attributed to evaporation from the additional 4.2 acres of exposed groundwater in the pond. Review of aerial photographs available on the Mesa County website shows that the nine acres proposed for dry-up in this plan for augmentation were initially dried-up in 2009 and have remained in a dried-up condition since that time. Therefore, daily diversion records for the period 1972 through 2008 were used to assess the diversion amounts allocated to the Applicants in accordance with their 20.5 shares in the Larkin Irrigation Company. The Applicants' share of water diverted through Larkin Ditch was historically used to irrigate 64.2 acres of land on the Applicants' property. Six of the 64.2 acres were dried-up in accordance with the decree entered in Case No. 05CW076. The proposed nine-acre dry- up area and the six-acre dry-up area identified in the decree entered in Case No. 05CW076 are shown in Figure 3. Total diversions through the Larkin Ditch headgate for the period 1972 through 2008 are shoe n in Table 2. Table 3 presents the Applicants' share of the total diversions based on their ownership of 20.5 of the 90 shares issued and outstanding in the Larkin Irrigation Company. Delivery of diversions to the Applicants' property, assuming a 10 percent ditch conveyance loss. is presented in Table 4. The amount of irrigation water deli%ered to the property and mailable for consumptive use on a per acre basis, assuming an irrigation efficiency of 45 percent, is shown in T able 5. B. Irrigation Water Requirements: DWR's StateCU software was used to estimate the irrigation water requirements per acre for pasture grass at the Applicant's property. The resulting irrigation water requirements for the period are presented in Table 6. The diversions available for consumptive use per acre presented in Table 5 and irrigation water requirements per acre presented in Table 6 were used to generate the historical consumptive use values per acre shown in Table 7. C. Calling Period to Augment: The primary calling structures downstream of the Pit are the Grand Valley Canal and Grand Valley Project (referred to as the "Cameo Call").