2025-02-28_HYDROLOGY - M1977205 - Laserfiche WebLink

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Tri-County Gravel Pit, M77-205 Page 7 of 13 February 27, 2025 - Distance from stream to aquifer boundary for Irrigation Return Flow (W) = 3,200 feet Tables 3 and 4 represent the net depletions from the proposed dewatering, groundwater lost with mined product, washing of mined product, dust suppression and recharge program, first without irrigation in Table 3, then with irrigation in Table 4. The total lagged depletions annually without irrigation are 73.54 acre-feet per year, the estimated out-of-priority lagged depletions are 48.54 acre-feet per year, and the required release from Crystal Reservoir including transit loss of 4.58 % (0.15 % per mile for 30.5 miles) is 50.46 acre-feet per year. If the delivery of the dewatering flows to Reclaimed Pond exceeds the recharge capacity of the alluvial aquifer, so that irrigation of the designated 31 .9 acres becomes necessary, then the total lagged depletions annually with irrigation are 101 .53 acre-feet per year, the estimated out-of-priority lagged depletions are 54.61 acre-feet per year, and the required release from Crystal Reservoir including transit loss of 4.58 % (0.15 % per mile for 30.5 miles) is 57.11 acre-feet per year. Replacements The increase in water use proposed in this SWSP is allowable under the use restrictions established in the DRMS mining permit and the 99CW216 augmentation plan. The stream depletions caused by the additional water uses are proposed to be replaced through a contract to be obtained with the U.S. Bureau of Reclamation for releases from Crystal Reservoir. The point of depletion associated with the Tri-County Gravel Pit is the North Fork of the Gunnison River approximately one mile upstream from the town of Hotchkiss. Based on review of call records and discussion with the water commissioner, the only structure downstream of the Tri-County Gravel Pit that has a potential of placing a