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<br />August 19. 1999 <br /> <br />1548 <br /> <br />and gravel lakes upstream and downstream of Fountain Creek. The MODSIM model will be <br />used to account for exchanges into the gravel lakes on a monthly basis. Additional inflow nodes <br />will be required for the native Arkansas River inflows. <br /> <br />Williams Creek Reservoir <br /> <br />Williams Creek Reservoir is a proposed storage facility which has been included in the long- <br />range water supply plan for CSU. Although the Williams Creek Reservoir alternative was not <br />included on the original list of alternatives suggested for further review in the GEl study. the <br />alternative has been included in this study because of its inclusion in CSU's planning. Williams <br />Creek Reservoir could also be utilized by other SECWCD entities especially those on Fountain <br />Creek to augment their water supplies. Current CSU planning envisions Williams Creek to be a <br />15,000 ac-ft (12,000 ac-ft active) facility which would be used to regulate the release of reusable <br />return flows to Fountain Creek thereby increasing the efficiency of exchanges on the Arkansas <br />River. Williams Creek Reservoir could be enlarged by 16,000 acre-feet for additional uses. <br />Williams Creek Reservoir is the last component of CSU's proposed Southern Delivery System. <br />The location of the proposed Williams Creek Reservoir is illustrated in Figure 1. <br /> <br />The current time line for CSU's implementation of Williams Creek Reservoir is the year 2034. <br />It is possible that this time frame could be moved forward and the concept as proposed by CS U <br />could be expanded into a regional water storage facility. A 1991 report funded by CSU (CH2M <br />Hill, 1992) indicates that site topography might be suitable for a reservoir with a capacity of up <br />to 3 I ,000 ac-ft. The dam would be an earthfiIl structure with a crest length of 6,500 ft, a <br />maximum height of approximately 80 ft, and would inundate an area of 1,100 ac. <br /> <br />Modeling Approach to Evaluation and Analysis of Storage Utilization <br /> <br />Williams Creek Reservoir could be used by Colorado Springs as well as other FV A entities. The <br />storage requirements in Williams Creek have previously been determined by CSU. Other <br />storage uses would need to be determined by the individual project beneficiaries. This includes <br />the use of Williams Creek Reservoir by other FV A entities, or for other uses. <br /> <br />Potential sources of inflow to the additional storage space in Williams Creek Reservoir include: <br />. Exchanged Water (e.g. CSU return flows for exchange to Pueblo Reservoir); <br /> <br />Potential beneficiaries of Williams Creek Reservoir storage could include: <br />. Colorado Springs Utilities <br />. Other FV A entities <br /> <br />The MODSL\1 network will be modified with an additional storage node to account for storage <br />in the reservoir, as well as the addition of native Arkansas River inflows. The MODSL\1 model <br />will be used to account for exchanges with Pueblo Reservoir on a monthly basis. <br /> <br />9 <br />