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<br />. . <br />. . <br />. <br /> <br />c:. , <br />~ <br />t- <br />.... <br /> <br />DiHP'~' lUVER RESERVIO-3S NO_ 1 A.."m ~O_ 2 <br />VM'lm Y'n':T.n MALYSIS <br /> <br />. <br /> <br />...,.." <br /> <br />" <br /> <br />INTRODUCTION <br /> <br />t;:, <br /> <br />Enartech, Inc. has completed its reconnaissance level <br />analysis of the "safe annual yield" of the proposed Yampa River <br />Re servoir' s No. 1 and No.2. Reservoir No.1 is located on the <br />Yampa River, approximately 25 miles ~lest of Craig, Colorado <br />(FiqQre 1)_ Reservoir No.2 is located approximately 2S miles <br />west of No.1 also on the Yampa River. The "safe annual yieJ,d". <br />represents the amount of water that can be reliably stored 'and <br />delivered to downstream markets on a lonq-term basis, including <br />periods of moderate to severe drouqh t. The st udy incl uded; a <br />review of existinq technical reports appurtenant to the area- <br />interviews with local water resource officials; research of <br />diversion records and water riqhts decrees; and the development <br />of a sophisticated hydroloqic computer model of the Yampa River <br />basin. <br /> <br />In summary, it appears that the Yampa River Reservoirs No. 1 <br />and No. 2 can reliably deliver a substantial supply of ",ater to <br />downstream markets in all water years. The calculated safe <br />annual yields ranqe from 360,000' acre feet (af) to 725,000 af, <br />depending upon the ultimate level of water. development within <br />Colorado and the future ac1ministration of water delivery <br />requirements imposed by the Upper Colorado River Basin Compact of <br />1948. The study's methods, assumptions and results are <br />summarized below. <br /> <br />. Study Methods <br /> <br />The study utilized a time-sequential analysis of historic <br />streamflow conditions to identify storable volumes over a <br />representative range of anticipated flows. The study period 1951 <br />through 1979 was selected for study because it was judged to be <br />representative of historic and future streamflow conditions_ <br />This period contains the driest year of record and the moderate <br />to severe drouqht period 1963 throuqh 1967, as well as ~ome of <br />the wettest years of record.. . <br /> <br />The. projected operation of the two reservoirs wa~ simulated <br />over the study period wi th a computer model developed for the <br />Yampa basin. The model allocates water to a particular storage <br />project based upon the amount of water that is PhYSically <br />available in the river and the project's relative priori.ty <br />compared to competing water users in the basin. ~he model's <br />operating assumptions are flexible and can be easily modified to <br /> <br />1 <br /> <br />Ide~tified water y"ields do not i.nclude transit losses <br />associated with delivery to downstreaa garkets. <br />