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<br />1543 <br /> <br />August 19, 1999 <br /> <br />Potential sources of inflows to the additional storage space include: <br />. Winter Water; <br />. Exchanged Water (e.g. CSU return flows exchanged to Pueblo Reservoir); <br />. Water rights transferred and exchanged (e.g. Colorado Canal water rights) or water <br />purchased and transferred (e.g. storage to regulate replacement water for well pumping); <br />. Transfer and storage of water from upstream reservoirs. <br /> <br />The total exchange potential into Pueblo Reservoir would be calculated on a daily basis using <br />ArkEx and compiled on a monthly basis for use in MODS 1M to detennine the additional <br />potential for storage of return flows by exchange in Pueblo Reservoir. <br /> <br />Potential beneficiaries of project reoperations could include: <br />Upper storage (Turquoise Reservoir and Twin Lakes) <br />. Entities West of Pueblo <br />. Aorence <br />All project storage (Turquoise Reservoir, Twin Lakes and Pueblo Reservoir) <br />. Winter Water <br />. Colorado Springs Utilities <br />. Other FV A entities <br />. Pueblo Board of Water Works <br />. St. Charles Mesa <br />. Pueblo West Metropolitan District <br />. Public Service Company <br />. Storage to regulate replacement water for well pumping <br /> <br />No modifications other than the addition of native Arkansas River inflows will be needed to the <br />existing MODSIM network for this alternative. <br /> <br />Structural Alternatives <br /> <br />Pueblo Reservoir Enlargement <br /> <br />A physical increase in the size of Pueblo Reservoir is also under consideration. Pueblo Reservoir <br />Dam is located on the Arkansas River just upstream of the City of Pueblo (see Figure 1) and has <br />a storage capacity of 357,000 ac-fl. The dam rises approximately 180 ft above the river-bed and <br />consists of an earthen embankment with a 1,750 ft long concrete center section dam and <br />massive-head buttress-type spillway. The total length of the dam structure including earth and <br />concrete sections is approximately 10,500 fl. <br /> <br />The U.S. Bureau of Reclamation is currently evaluating the technical feasibility of, and costs <br />associated with, increasing storage in Pueblo Reservoir. The alternative is attractive because <br />relatively small increases in dam height of 4 to 6 feet would provide relatively large increases in <br />storage capacity of approximately 25,000 to 75,000 ac-ft. <br /> <br />4 <br /> <br />__...-n.. <br />