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2.0 SUMMARY AND CONCLUSIONS West Slope water storage facilities, such as Green Mountain Reservoir and Ruedi Reservoir. are an important source of water for municipal, industrial and environmental uses. At present, the contract demand for these two reservoirs is approximately 55,000 acre feet per year. With continued growth in the area, the demand for reservoir water will increase significantly. We estimate that reservoir demands will increase by 15,000 to 20,000 AF, or more, within the next fifty years. The marketable yield of Wolford Mountain Reservoir, and water leased to the River District from Ruedi Reservoir, can supply a significant portion of these anticipated future water demands. 2.1 FUTURE WATER DEMANDS Municipal demands for water right augmentation supplies will continue to increase. Water users will be required to augment depletions to the senior Shoshone and Cameo rights on the Colorado River. Certain users with water rights junior to 1995 may also require water to augment anticipated instream flow claims for the mainstem of the Colorado River. Water users throughout the upper Colorado River basin can use water from either Wolford Mountain Reservoir or Ruedi Reservoir to augment depletions to these senior demands. Municipal users on select tributaries to the Colorado River will require additional augmentation water to offset local water right calls; however, releases from Wolford Mountain Reservoir or Ruedi Reservoir also can provide valuable augmentation supplies to these users. Population estimates, water use patterns and water market factors have been reviewed to estimate potential future municipal demands. Based on this review, we estimate that municipal augmentation demands from facilities such as Ruedi and Wolford Mountain reservoirs could increase by 10,000 to 15,000 acre feet, or more, by the year 2045. Industrial augmentation demands will also increase and several industrial users have expressed interest in leasing water from the District. It is difficult to anticipate the specific amount of increased industrial demand that may occur. However, we believe that it is reasonable to expect that without development of an oil shale industry, industrial demands could increase by several thousand acre feet or more during the next fifty years.' If significant ski area expansion or oil shale development occurs, the industrial demand could increase much more than this amount. Additionally, a potential out-of-basin water market exists. Trans-basin users could release water from an in-basin reservoir (such as Wolford Mountain Reservoir) to augment out-of-priorily trans-basin diversions. We estimate that a dry year demand for existing out-of-basin water uses could exceed 5,000 acre feet. Water leased for out-of-basin purposes could be leased on a temporary interruptible basis. In this regard, water could be leased to out-of-basin interests in only those years when adequate water is available for all in-basin uses. It may also be possible to exchange water with selected trans-basin interests in order to obtain in-basin supplies in geographic areas that require local augmentation, such as the Eagle River basin or the Fraser River basin. I J 2