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<br />~ <br /> <br />'\ <br />~ <br /> <br />~ <br /> <br />~ <br /> <br />~ <br /> <br />; <br />I <br /> <br />I <br />I <br />I <br />. <br />I <br />I <br />I <br />I <br />. <br />I <br />. <br />. <br />. <br /> <br />,. <br /> <br />. <br /> <br />. <br /> <br />EXECUTIVE SlJMMARY <br /> <br />STIIDY OBJECTIVES <br /> <br />The Small Reservoir Feasibility Study was initiated by the Summit County <br />Commissioners with support from the Colorado Water Conservation Board (CWCB) and <br />other entities. The general objectives of the study were to analyze means to: 1) assure <br />adequate water supplies and instream flows above and below Dillon Reservoir, 2) provide an <br />emergency water supply for the Town of Dillon and Dillon Valley in the event of hazardous <br />materials spills on 1-70, and 3) meet the mitigation requirements which Federal agencies <br />might impose in connection with County water uses under the Green Mountain Reservoir <br />Water Marketing Program. <br /> <br />STIIDY APPROAClI <br /> <br />The study was conducted in three phases, In Phase 1, basic data and information <br />pertaining to Blue River basin hydrology, water rights, and water demands were compiled <br />and reviewed, In Phase 2, candidate water management alternatives were defined and a <br />computer simulation model of basin hydrology and water rights administration was <br />developed. In Phase 3, the model was used to quantify needs for additional water supplies <br />under ultimate demand conditions and to evaluate the ability of various water management <br />alternatives to meet those needs, <br /> <br />The study was directed by a Steering Committee comprising representatives of the <br />County, the CWCB, major County water users, and other key upper Colorado River basin <br />water interests. This Steering Committee met frequendy over the course of the study to <br />provide guidance and feedback on study progress. <br /> <br />DEVELOPMENT OF TIIE STIIDY INFORMATION BASE <br /> <br />The study information base consisted of data on basin hydrology, water rights, and <br />water demands. Data was compiled on historical basin hydrology and water uses for the <br />period encompassing water years 1952-82. Monthly virgin flows at four key points were <br />estimated by adjusting gaged flows for the effects of upstream diversions and depletions. <br />Elevation-yield relationships were then developed and used to disaggregate those virgin <br />flows among 51 inflow points throughout the basin, This resulted in a disaggregated set of <br />inflow data for later use in the basin model. <br /> <br />The water rights and agreements of Blue River basin water users and the Colorado <br />River water rights influencing water use in the basin were reviewed in detail. The various <br />agreements and stipulations affecting the relative priorities and uses of water rights in the <br />basin were also analyzed. The significant water rights were then tabulated in order of <br />priority and referenced to specific water diversion systems for later use in the basin model. <br />Table $-1 presents a general listing of the water rights and agreements incorporated into the <br />basin model. <br />