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. SECTION II SUMMARY OF ESTIMATED WATER YIELD A. GENERAL A reconnaissance level study was undertaken by Wright Water Engineers Inc. (WWE) to evaluate the future water yield of the proposed Webster Hi 11 Reservoir. The following is a surrrnary of WWE's "Analysis of Yield" for the Webster Hill Reservoir storage right. is attached as Appendix B. Expected Water The WWE report . The future yield of the reservoir depends on the development or non- development of water resource projects in the Colorado River Basin. There are numerous water rights senior to this project that could limit the yield of the Webster Hill Reservoir. Some of these water resource projects include transbasin diversions to the eastern slope, Federal and state storage and irrigation projects, and oil-shale industry projects. Any proposed water resource projects downstream of the reservoir could help sustain flows past the dam, maintaining a flow for operation of the hydropower plant. . In order to evaluate the expected water yield of the Webster Hill Reservoir, the WWE report adopted much of the same methodology used in the Water Rights Evaluation and Stable Flow Analysis prepared for the Una Reservoir Feasbi1ity Report by Leonard Rice Consulting Water Engineers, Inc. The steps associated with the above methodology follow: 1) gaged flows on the river are adjusted to the reservoir's location; 2) historic virgin flow at the reservoir site is derived by (adding existing upstream depletions to the adjusted gaged flows; 3) future water resource development scenarios are projected; 4) water rights senior to the Una storage right are determined and arranged in order of magnitude above certain cutoff values, then projected according to likelihood and incorporated into their respective scenarios; 5) future upstream dep let ions are esca 1 ated, then future downstream demands are determined; 6) calculated inflows 3686-a/6 II-I