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<br />Engineering Stream Simulation Model (BESTSM) was selected because of its unique capabilities for <br />handling various hydrologic conditions encountered in the study area. BESTSM accounts for <br />monthly water volumes of inflows, diversions, return flows, river gains and losses, and outflows for <br />each segment of the stream system and allocates water based on the Colorado water rights priority <br />system and other legal and institutional arrangements. <br /> <br />Water Yield for Reservoirs and Reservoir Combinations- Firm annual yields for the six <br />reservoirs selected and for the four representative combinations of reservoirs are presented in <br />Table S.1. The firm annual yield estimates were based on a projected high future-level of water <br />development in the basin with two different Green Mountain operating conditions. The first Green <br />Mountain Reservoir operating condition assumes that the Reservoir would continue to operate as <br />originally prescribed in Senate Document No. 80. The second condition assumes that the pumpback <br />system from Green Mountain Reservoir to Dillon Reservoir and the associated water exchange <br />arrangement would be in operation. <br /> <br />Some of the proposed reservoir sites are in effect alternative locations for regulating the <br />same water. When more than one reservoir is added in the upper portion of the basin, the yield of <br />the combination of reservoirs is less than the sum of the yields of individual reservoirs. <br /> <br />RESERVOIRS <br />Nine sites were initially designated as candidates for Joint-Use or Replacement Reservoirs, <br />Screening analyses reduced these to six dam sites. Dimensions of the six dams and reservoirs <br />considered in this reconnaissance-level study are presented in Table S.2. The study has involved <br />review of previous reports and published data, site investigations, hydrological analyses, preliminary <br />design and project cost estimates. <br /> <br />4 <br /> <br />--' <br /> <br />--' <br /> <br />~ <br /> <br />-- <br /> <br />-- <br />