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I I: I: I~ I: f -, .1. i' I I I; CONCLUSIONS The water supply on Gore Creek was analyzed to evaluate potential changes in the streamflow from future diversions by the Vail Valley Consolidated Water District because of water purchased from Green Mountain Reservoir. A simulated-streamflow operation study was developed for Gore Creek which utilized historic discharge data, calculated tributary inflow, stream losses, VVCWD diversions, and VVCWD return flows. The operation study covered September 1976 through Harch 1978, water year 1972, and wster year 1970. These periods were assumed to reflect dry, average, and wet hydrologic conditions, respectively. The results of the analysis showed that, although sufficient water existed for diversion during each of the study periods, potential significant reductions in s~~amflow might occur. -- I: Another factor identified during the study which significantly affects available streamflow on Gore Creek was the existing instream-flow requirement. The specific effects of these instream-flow rights was not evaluated because the policies under which the rights would be administered on Gore Creek have not been clearly stated by the Colorado Water Conservation Board. These instream requirements have the potential to control present and future diversions from Gore Creek, regardless of water availability from Green Hountain Reservoir. Determining the sJ~ctfic_~f~ects of these rights on future 0" _ _ ______ __ VVWCD diversion is beyond the s_c~pe ~_of _ t.lli,!' study-,-_ The)' are noted here_as_a_ significant source of potential conflict. I: I: I I I, I: I -- ----~- This investigation attempted to answer complex questions about the hydrologic environment of Gore Creek usin~ previously published data and sound assumptions. The water-use data requested from VVCWD through the water service application process was in monthly increments. Although daily-average discharge data are available for some years in the Gore Creek basin, the necessary correlation and extension of data for ungaged areas made the use of daily data impractical. The discharge figures presented in Tables 5 and 6 are monthly averages. There are many factors which could cause the actual flow in Gore Creek to be significantly different from the monthly average on any single day, given the conditions of development described in this study. To -19- I.. , , ..