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A number of possible explanations exist for the variation in number of wells tied to acreage from <br />the list of wells in HydroBase, including: <br />• 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 />Central uses numerous gravel pit storage units, recharge projects, ditch company and reservoir <br />company shares, augmentation wells, and leased reusable supplies in its plan. Some of the shares <br />were already changed for augmentation uses when the GMS decree was adjudicated (May 2005). <br />Other shares originally owned by GMS, and shares subsequently purchased by the subdistrict, <br />have been included in numerous succeeding Water Court change case applications (about 35 <br />pending change cases for Central, both GMS and WAS, as of early 2007). Central also has <br />annual and multi-year leases for the use of reusable effluent and ditch and reservoir company <br />shares from various entities included in numerous SWSPs filed to supplement the GMS decreed <br />sources. <br />Per the GMS decree, lagged well depletions and recharge accretions to the South Platte River are <br />accounted via the Glover method. Wells within the GMS subdistrict were typically not metered, <br />although all wells covered under the Central plan will have meters installed by Apri12008. Per <br />the GMS decree, out-of-priority lagged well depletions are administered with priority dates <br />specific to the ground water rights included in the plan. <br />Recommendations <br />The Central operations are complex due to the ever-changing portfolio of water supplies used for <br />augmentation purposes. Recommendations for representing the Central GMS augmentation plan <br />in the initial development of the SPDSS StateMod Water Resources Planning Model input files <br />are presented below, based on discussions with Central's engineer and review of available <br />information in HydroBase (Version 20060816). <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 six Central <br />augmentation plan system depletions plan structures corresponding with administration of the <br />augmentation plans in six reaches, Reach A through Reach F, listed below based on approximate <br />administrative locations: <br />• Riverside Ditch to Upper Platte & Beaver Ditch (9903334_A) <br />• Lower Platte & Beaver Ditch to Riverside Ditch (9903334_B) <br />A-4 of A-106 <br />