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APPENDIX A-8 Sedgwick County Well Users Augmentation Plan -Plan ID 6402517 <br />Sedgwick County Well Users is an umbrella organization that covers well users under multiple <br />ditch systems and ground water-only parcels in the lower part of the South Platte River within <br />the State of Colorado (see Figure 1). The Sedgwick County Well Users operated under an SWSP <br />from 2003 until the augmentation plan (Case No. 03CW209) was decreed in November 2005. <br />Wells in the Sedgwick County Well Users Plan were historically enrolled in GASP. <br />The number of wells associated with the augmentation plan from sources reviewed for this effort <br />is summarized in Table 1. <br />Table 1 <br />Wells Associated with Sed wick Count Well Users Au mentation Plan Plan ID 6402517) <br />Source Number of Wells <br />03CW209 decree 136 <br />HydroBase associations (Version 20060816) 140 <br />Tied to acreage in GIS Irrigated Acreage Assessment* 121 <br />User interview 135 <br />* Subset of HydroBase association based on wells decreed for irrigation with decreed rates greater than 50 gpm and specifically <br />tied to lands in the 2001 Irrigated Acreage Assessment. <br />A number of possible explanations exist for the variation in number of wells listed in the decree <br />versus HydroBase, including: <br />• Some augmentation plan decrees allow wells to be added to the plan without re-adjudicating <br />the plan. <br />• Some of the listed HydroBase wells may be recharge wells, augmentation wells, or decreed <br />for other uses. <br />• Some wells may have been replaced and the original wells are still included in HydroBase. <br />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 />Recharge projects were adjudicated in the Sedgwick County Well Users Augmentation Plan to <br />provide replacement water supplies and are operated under the Settlers, Highline, and Peterson <br />Ditches. Multiple recharge reservoirs, recharge wells, and augmentation wells are included in the <br />decree. Most of the irrigation wells are currently metered. Pumping is estimated for some <br />irrigation wells based on power coefficients. Decreed Glover factors are used to lag well <br />depletions to the river. Per the decree, out-of-priority lagged well depletions are administered <br />with priority dates specific to the individual wells. Operationally, wells are administered based <br />A-44 ofA-106 <br />