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APPENDIX A-6 Lower Logan Well Users Augmentation Plan -Plan ID 6402536 <br />Lower Logan Well Users is an umbrella organization that covers well users under multiple ditch <br />systems in Water District 64, located predominantly in the eastern part of Logan County (see <br />Figure 1). The depletion reach for the Lower Logan Well Users is along the South Platte River <br />between Sterling and Crook, which extends from about the Bravo Ditch down to the Settlers <br />Ditch. The Lower Logan Well Users operated under an SWSP from 2003 until the augmentation <br />plan (Case No. 03CW208) was decreed in January 2005. Wells in the Lower Logan Well Users <br />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 Lower Logan Well Users Augmentation Plan (Plan ID 6402536) <br />Source Number of Wells <br />03CW208 decree 145 <br />HydroBase associations (Version 20060816) 160 <br />Tied to acreage in GIS Irrigated Acreage Assessment* 129 <br />User interview 145 <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 />Eight recharge projects were adjudicated in the Lower Logan Well Users augmentation plan to <br />provide replacement water supplies from recharge wells or surface water supplies diverted <br />through the Bravo Ditch, Iliff and Platte Valley Ditch, and Harmony No. 1 Ditch. About 56 <br />recharge sites under various ditches, approximately 15 recharge wells, and 32 augmentation <br />wells were adjudicated for augmentation and replacement purposes. Lower Logan Well Users' <br />A-34 ofA-106 <br />