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<br />1545 <br /> <br />August 19, 1999 <br /> <br />Modeling Approach to Evaluation and Analvsis of Storage Utilization <br /> <br />Storage in Turquoise Reservoir could meet a portion of the storage needs that have been <br />identified by the study participants primarily because it is located high in the Arkansas River <br />basin and releases could be delivered to most entities. The primary limitation to using this <br />storage location is site capacity, its cost, and the exchange potential. <br /> <br />Potential sources of inflows to the additional storage space in Turquoise Reservoir include: <br />. Exchanged Water (e.g. CSU return flows exchanged from 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 /> <br />The exchange potential into Turquoise Reservoir would be calculated on a daily basis using <br />ArkEx and compiled on a monthly basis for use in MODSIM to detennine the optimum storage <br />volume in Turquoise Reservoir. <br /> <br />Potential beneficiaries of additional storage space in Turquoise Reservoir could include: <br />. Winter Water <br />. Colorado Springs Utilities <br />. Other FV A entities <br />. Pueblo Board of Water Works <br />. St. Charles Mesa <br />. Florence <br />. Pueblo West Metropolitan District <br />. Entities West of Pueblo <br />. Public Service Company <br />. Storage to regulate replacement water for well pumping <br /> <br />The MODSIM network will be modified with an additional storage node to separately account <br />for storage in the enlarged portion of Turquoise Reservoir, as well as the addition of native <br />Arkansas River inflows. <br /> <br />Lake Meredith Enlargement <br /> <br />Lake Meredith is located in a topographic depression (or closed basin) with no naturally <br />occurring hydraulic outlet. Geographically, it is the terminus of Bob Creek and historically held <br />one or more shallow lakes that may have only filled seasonally. The lake is located <br />approximately 10 miles north of Rocky Ford in the Arkansas River Basin as illustrated in Figure <br />1. Use of Lake Meredith for irrigation purposes began in 1926 with the construction of the Lake <br />Meredith Dam and Lake Meredith Outlet Canal. The original dam, which remains in place to <br />this day, essentially extends only across the excavated outlet canal and is not substantially higher <br />than the natural ground. Currently, Lake Meredith dam provides a usable storage capacity of <br />41,413 ac-ft. <br /> <br />Enlargement of Lake Meredith has been investigated in studies by W.W. Wheeler and Associates <br />in 1984 and URS GreinerlWoodward-Clyde in 1998. The more recent URS Greiner report <br /> <br />6 <br /> <br />-.....,.". <br />