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Findings of Fact.Conclusions of Law,Ruling of the Referee and Decree of the Water Court Thomas F.and Ginger L.Latham 23CW3022 Page 6 Based on discussions with a representative of the Division Engineer' Office of Water Division 5, the call period for the Cameo Call includes three weeks in April, one week in May, and the last 2 weeks in June through October. A monthly water balance utilizing historical irrigation credits to offset potential out-of-priority depletions attributed to evaporation from 4.2 acres of exposed groundwater in the existing pit pond is presented in Table 8. As shown,the historical irrigation credits will fully offset potential out-of-priority depletions. D. Historical Irrigation Return Flows: Historical irrigation return flows must be maintained to support the use of historical irrigation credits for augmentation. Historical return flows include both surface and deep percolation. The surface irrigation return is estimated to be 80 percent of the irrigation return and instantaneous return to the river is assumed. Deep percolation is assumed to account for 20 percent of the irrigation return, and the timing of accretion to the Colorado River from deep percolation was estimated using the Well Pumping Depletion Model (©2001, Western Water Consulting, Inc.). The resulting irrigation return flow analysis is summarized in Table 9. As shown. historical irrigation return flow during the call period are maintained by accretions to the river resulting from historical diversions left in the river. E. Amounts Needed for Augmentation: The nine-acre dry-up area represents 14 percent of the 64.2 acres historically irrigated at the Applicants' property. Accordingly, 14 percent of future irrigation diversions to the Applicants' property will be dedicated for augmentation use. The amounts needed for augmentation will be 0.80 cfs of the Senior Larkin Right and 0.40 cfs of the Junior Larkin Right for a total of 1.20 cfs under both rights, or 2.86 of the Applicants' shares in the Larkin Irrigation Company.Therefore,an additional three of the Applicants' Larkin Irrigation Company shares will be dedicated for use under this plan for augmentation. F. Change Requested: The Applicants request that the water rights represented by the additional three shares of the Applicants' Larkin Irrigation Company shares be changed to allot for evaporation from 4.2 acres of the exposed ground ater in the existing pit pond b) augmentation and replacement. in addition to irrigation uses. G. Operation of the Plan for Augmentation: During times of a valid downstream call during the call period. 14 percent of Applicants' share of Larkin Ditch diversions will be administered in accordance with this plan for augmentation. To meet the obligation to augment w ith a total of 1.2 cfs under full-supply conditions. 1.08 cfs of the combined Senior and Junior Larkin Rights, assuming 10 percent ditch carriage loss, will not be delivered for use on the Applicants' property but will be diverted back to the Colorado River at or near the Larkin Ditch headgate. The remaining 0.12 cfs will be left in the Larkin Ditch to make up for carriage losses.