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<br />-- <br />I <br />I <br />:1 <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I, <br /> <br />,,'Q'"'1 <br />,I' " , <br />r' ' ...._~. <br /> <br />10 <br /> <br />II. Data and Assumptions <br /> <br />A. Period of Record <br /> <br />The analysis was done on a historic, water year basis (October through <br /> <br />September). The period of record was from 1952 through 1983. Diversions <br /> <br />at the Gunnison Tunnel were highly developed during this period, with no <br /> <br />discernible trend. <br /> <br />(See Appendix C.) This period also contains a wide <br /> <br />range of hydrologic conditions with significant dry periods. Figure 2 is <br /> <br />a hydrograph of the annual virgin flows above Crystal for this period. <br /> <br />These virgin flows average 1.22 million acre feet per year, while the <br /> <br />virgin flows over a longer 1906-1983 period average 1.32 million acre feet <br /> <br />per year. <br /> <br />B. Ir,flow Data <br /> <br />The inflow data for the model consists of undepleted virgir, flows. <br /> <br />Inflow data sets above four locations were necessary for the model: Taylor <br /> <br />Park, Blue Mesa, Morrow Point and Crystal. It was assumed that no gains <br /> <br />accrued to the Gunnison River below Crystal. All inflow data have been <br /> <br />taken from USBR input data for the CRSS studies. <br /> <br />WBLA, Inc. 1909 Broadway, #3, Boulder, Colorado 80302 <br />