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<br />~ <br /> <br />Phase I of the Blue River exchange/joint use reservoir project <br /> <br />would utilize water from one or more existing West Slope reservoir. <br /> <br />Phase 2 of the exchange would use water from new storage projects to <br /> <br />maximize the potential yield. New reservoirs that could provide <br /> <br />additional water supplies needed for the exchange include the repre- <br /> <br /> <br />sentative joint-use reservoir at the Wolford Mountain site and/or the <br /> <br /> <br />proposed Rock Creek Dam and Reservoir. <br /> <br />New Safe Yield <br />The new safe yield of the Blue River exchange/joint use reservoir <br />would depend on how much water could be made available for delivery in <br />fulfillment of the purposes of Green Mountain Reservoir from sources <br />other than the Blue River. The new safe yield could range up to 24,000 <br />acre-feet. There are three general sources of such potential West <br />Slope exchange water supplies: <br /> <br />Yield from the operation of Williams Fork Reservoir; <br /> <br />Purchase or lease of yield in other existing reservoir facili- <br />ties such as Granby Reservoir; and <br /> <br />Development of new yield by construction of one or more new <br />reservoirs on the West Slope. <br /> <br />The first source, the use of Williams Fork Reservoir for exchange <br /> <br /> <br />purposes, would provide, in the near-term, an increase in safe yield at <br /> <br />Dillon Reservoir of 10,000 acre-feet per year. However, the new safe <br /> <br />yield from the use of thst reservoir for the exchange would be reduced <br /> <br /> <br />if the Williams Fork extension project were const ructed. Thus, the <br /> <br />long-term yield increase at DIllon Reservoir from this source could be <br /> <br />less than 10,000 acre-feet per year. <br /> <br />29 <br />