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• Wells may be mis-located in the GIS coverage and therefore not assigned to irrigated <br />parcel(s). <br />• Wells are not active. <br />• Wells not decreed or decreed for less than 50 gallons per minute. <br />• Wells are decreed for other uses (e.g., augmentation, recharge, domestic, municipal, <br />commercial, stock water, etc.). <br />• The association of a well to the augmentation plan ID may be incorrect in HydroBase. <br />System Overview <br />Twelve recharge projects were adjudicated in the Logan Well Users Augmentation Plan to <br />provide replacement water supplies. Five of the projects have shares in ditch systems with them <br />that can be used to provide surface water directly to recharge reservoirs. The multiple recharge <br />reservoirs under these recharge projects can also be filled with recharge wells. The other seven <br />decreed recharge projects use recharge wells, pumps, or seeps as the primary fill source. Junior <br />exchange water rights are decreed within the depletion reach up to the augmentation wells and <br />five ditches (Prewitt Inlet Canal, South Platte Ditch, Schneider Ditch, Springdale Ditch, and <br />Sterling No. 1 Canal) to fill the recharge sites. <br />Over 50 recharge sites under various ditches; approximately 13 recharge wells; and 42 <br />augmentation wells are adjudicated in the Logan Well Users plan for augmentation and <br />replacement purposes. The Smart Land/Livestock augmentation plan includes a storage right for <br />recharge. Per the Logan Well Users decree, lagged well depletions and recharge accretions to the <br />South Platte River are accounted via the Glover method. None of the wells were historically <br />metered or have calibrated electric coefficients; therefore, no actual pump records are available. <br />Per the Logan Well Users decree, out-of-priority lagged well depletions are administered with <br />priority dates specific to the ground water rights included in the plan. <br />Recommendations <br />Recommendations for representing the Logan Well Users augmentation plan system in the initial <br />development of the SPDSS StateMod Water Resources Planning Model input files are presented <br />below based on review of the decree and interviews with augmentation plan personnel and <br />Division 1 personnel. <br />Augmentation Plan Demands <br />To represent pumping for the entire SPDSS study period (1950 to present), well pumping to <br />supply irrigated lands should be estimated by the consumptive use algorithm in StateCU and <br />StateMod, to meet the irrigation water requirement less simulated surface water deliveries (if <br />applicable). Lagged well depletions affect river flows based on timing and location factors <br />defined in StateMod input files. Lagged depletions should be accounted in two Logan Well <br />Users augmentation plan system depletions plan structures corresponding with administration of <br />the augmentation plans in two reaches: <br />• Above Sterling No. 1 Ditch (6402539_1) <br />• Below Sterling No. 1 Ditch (6402539_2) <br />A-20 ofA-106 <br />