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<br />MWSI Project <br />Phase" Conjunctive Use Summary Report - DRAFT <br /> <br />August 22, 1995 <br /> <br />Water delivered from surface water sources for conjunctive use demands or for storage in <br />the conjunctive use peaking reservoir would be delivered via the South Platte River or Clear <br />Creek with diversions in the vicinity of the South Platte/Clear Creek confluence. Water supplies <br />would be delivered via a closed pipeline shown schematically on Figure 9. <br /> <br />Water supplies to meet conjunctive use demands are assumed deliverable to the northern <br />metro area by a distribution pipeline from the conjunctive use reservoir to Arvada again as <br />shown in Figure 9. Under this conceptual plan, deliveries are assumed available to the northern <br />water providers, including South Adams County, Commerce City, Thornton, Westminster, <br />Northglenn and Arvada, A second pipeline is shown distributing supplies south to Aurora in the <br />vicinity of Mississippi and Tower Roads, While these mayor may not be customers under a <br />consumptive use plan, this system would be representative of a delivery system to a developing <br />area and the costs of this pipeline should be representative of any conjunctive use delivery <br />system, Pay backs to the participating surface water supply system or systems would be made <br />through the potable water transmission system with an interconnection at DIA again as shown on <br />Figure 9, <br /> <br />The second conceptual conjunctive use scenario is based upon maximizing the use of <br />existing well field systems and providing yield for reducing existing aquifer depletions as well as <br />for new growth, The largest existing well fields are located in the southeast portions of the <br />metropolitan area, A potential conjunctive use well field could overlay this area utilizing <br />existing well sites, The well field would cover an extensive area in eastern Arapahoe and <br />northern Douglas Counties as shown in Figure 10, This well field overlays the systems of the <br />Centennial Water and Sanitation District (Highlands Ranch), the Willows Water District, the <br />Castle Pines North and the Castle Pines Metropolitan Districts, the Inverness Water and <br />Sanitation District, the Meridian and Lincoln Park Metropolitan Districts (Stonegate), the East <br />Cherry Creek Valley Water and Sanitation District, the Arapahoe Water and Wastewater <br />Authority, the Parker Water and Sanitation District, the Pinery Water and Sanitation District, and <br />the Town of Castle Rock, <br /> <br />Current well field production, adjudicated water rights, and production capacity is shown <br />in Table 9, Current well field production amounts to approximately 22,000 acre-feet of water <br />supply annually, Water under this conjunctive use plan would provide 60,000 acre-feet of yield. <br />Hence, this supply would meet this 22,000 acre-feet of current groundwater demand with the <br />remaining 38,000 acre-feet of supply available for future taps. The groundwater rights of these <br />water providers currently amounts to some 66,000 acre-feet which is beyond the 60,000 acre-feet <br />required under the conjunctive use plan, In addition, the existing well infrastructure in these <br />districts can currently supply some 72,533 acre-feet per year if run year round, with the addition <br />of peaking reservoirs. <br /> <br />38 <br />