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APPENDIX A-1 Central Colorado Water Conservancy District -Ground Water <br />Management Subdistrict Augmentation Plan -Plan IDs 0103334, 0203334, 0303334, <br />0403334 & 0503334 <br />Central Colorado Water Conservancy District (Central) is an umbrella organization that covers <br />well users under multiple ditch systems and ground water-only wells in Adams, Weld, and <br />Morgan Counties (see Figure 1). The Central District is composed of the following two <br />subdistricts that extend from about the City of Brighton down to the City of Fort Morgan, <br />including significant portions of the Beebe Draw and Boxelder Creek drainages: <br />• Groundwater Management Subdistrict (GMS) <br />• Well Augmentation Subdistrict (WAS) <br />The GMS subdistrict operated since 1973 under an SWSP until its augmentation plan (Case No. <br />02CW335) was decreed in May 2005. The Groundwater Appropriators of the South Platte <br />(GASP), formed in 1973, was dissolved in 2004 because of subsequent years of full-time river <br />calls and insufficient replacement supplies to replace its member wells' depletions. A number of <br />GASP wells joined the GMS subdistrict and other augmentation plans in Water District 64. <br />The information presented below is based on discussions with Central's engineer and review of <br />available information in HydroBase (Version 20060816). The number of wells associated with <br />the augmentation plan from sources reviewed for this effort is summarized in Table 1. For GMS <br />augmentation plan (Plan IDs 0103334, 0203334, 0303334, 0403334, and 0503334), the WD <br />identifier is generally the same as the Water District where the member well is located, with the <br />majority of member wells located in Water Districts 1 and 2. The Water District 99 identifier (ID <br />9903334) is recommended to represent the augmentation plan since the member wells are <br />located in the five Water Districts and, as discussed below, administration reaches for the plan do <br />not coincide with the Water Districts. <br />Table 1 <br />Wells Associated with Central GMS Augmentation Plan (Plan ID 9903334) <br />Source Number of Wells <br />02CW335 decree 964 <br />HydroBase associations (Version 20060816)* 929 <br />Tied to acreage in GIS Irrigated Acreage Assessment** 857 <br />User interview About 900 <br />* Includes wells associated with the five GMS Plan IDs. <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-3 of A-106 <br />