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Section 2 <br />Existing Water System Profile <br />The City currently serves over 32,500 citizens as of the end of 2006 over a 27 square <br />mile service area (See Figure 1). The City owns and operates 2 separate water <br />systems (one potable and one non-potable), which utilize groundwater and surf ace <br />water respectively. The groundwater system is comprised of 11 production wells <br />that f eed 2 water treatment plants. The surf ace water system is compromised of 4 <br />ditch systems. The details regarding these two different water systems (i.e., <br />groundwater and surface water) are provided below. <br />Table 1-Summary of Annual Water Supply in 2006 <br />Annual Water Supply Annual Volume Number of Percent Metered <br /> (1,000 gallons) Sources <br />Groundwater 2,050,780 11 wells 100% <br />Surf ace Water 29,579 4 ditches 100 <br />Non-potable Water Billed 107,951 100 <br />Treated Water Billed 1,654,176 100 <br />Total Annual Water Sold in 2006 1,762,127 <br />Groundwater is the primary water resource f or the City and it is used exclusively for <br />potable water supply. Groundwater produced from the 11 wells owned and <br />operated by the City is pumped to one of two water treatment plants f or f filtration <br />and disinfection prior to distribution. Groundwater production occurs from two <br />separate tributary aquifer systems -the South Platte and the Beebe Draw. Although <br />current aquif er pumping exceeded 6,500 acre-feet, recent studies by the City indicate <br />that the sustainable annual yield of the current South Platte and Beebe Draw <br />production wells is about 4,500 acre-feet per year and about 900 acre-feet per year, <br />respectively. <br />Since the groundwater produced by the City is pumped from the South Platte and <br />Beebe Draw alluvium, it is considered tributary groundwater and must therefore be <br />augmented to off set depletions that occur out of priority. In general, the City is <br />allowed return flow credits for 95 % of wintertime use of the tributary groundwater, <br />since most, if not all, of the treated water used by the community during this time is <br />returned to the local wastewater treatment plant, treated and ultimately discharged <br />back into the South Platte. Summertime treated water use on the other hand has a <br />consumptive component related to outdoor irrigation water use which evaporates or <br />is taken up by plant material. The City is therefore required to augment tributary <br />groundwater that is consumed during the year by using ditch water that the City <br />has acquired. <br />City of Brighton Water Conservation Plan 2 <br />