2025-09-10_HYDROLOGY - M1994005 - Laserfiche WebLink

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Colona Pit SWSP Page 6 of 13 September 10, 2025 the groundwater return flow. According to this analysis it was determined that fifty percent (50%) of the total return flow accrues to the Uncompahgre River as surface return flow within the same month as the diversion and fifty percent (50%) accrues to the Uncompahgre River as groundwater return flow. The timing of the groundwater return flows was lagged to the Uncompahgre River using the Glover method with the following aquifer parameters: T = 50,000 gpd/ft, SY = 0.15, X = 2,000 feet, and W = 5,000 feet. After applying the 2.5 shares of Ouray Ditch water and accounting for owed return flows in replacing the out-of-priority lagged depletions, there will be 11.8 acre-feet of out-of-priority depletions remaining (Table 3, column 14). Tri-County Water The additional proposed source of replacement water for this pit during the irrigation season is water leased from the Tri-County Water Conservancy District (Tri-County). Up to 6.0 acre-feet/year of fully consumable water from Ridgway Reservoir will be used to supplement the consumptive use credits for the months of April and September (leases attached). A 1.65% transit loss will be applied to all deliveries from Ridgway Reservoir, subject to assessment and modification by the Division Engineer. This release is shown on attached Table 4. Blue Mesa Water The proposed source of replacement water for this pit during the non-irrigation season of November through March is fully consumable water released from Blue Mesa Reservoir by the U.S. Bureau of Reclamation. The Applicant has two contracts (attached) for Blue Mesa water, one for 5.0 acre-feet and another for 13.0 acre-feet. An 8.9% transit loss will be applied to all deliveries from Blue Mesa Reservoir, subject to assessment and modification by the Division Engineer. This release is shown on attached Table 4.