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<br />00313~ <br /> <br />Page 31 <br /> <br />currently planned by Denver. <br /> <br />In addition, the water demands associated with the <br /> <br />Colorado-Big Thompson project and West Slope use of Green Mountain Reservoir <br /> <br />were tested under existing and future levels. The results allowed evaluation of <br /> <br />effects on Denver's system yield and on potential water availability from the <br /> <br />Colorado-Big Thompson project and from Green Mountain Reservoir for use within <br /> <br />the Colorado River Basin. While there are other diversions in the sub-basin <br /> <br />which 'could benefit from increased runoff, such as the Windy Gap and Homestake <br /> <br />projects, it was felt that representative results could be obtained from <br /> <br />examination of the demands of Denver and Green Mountain reservoir. <br /> <br />F~ <br /> <br />1. Hydrologic data base <br /> <br />I <br /> <br />~ <br /> <br />D. <br /> <br />Data <br /> <br />Reconstructed historic virgin flow was used as the basis for the hydrologic <br /> <br />modeling.because consumption from the Colorado River has been increasing over <br /> <br />the historical period, and because the scope of the project did not allow for <br /> <br />development of synthetic traces. The flow data used were developed by the U.S. <br /> <br />I <br /> <br />Bureau of Reclamation for use with the Colorado River Simulation Model (USBR, <br /> <br />CRSM, 1983). <br /> <br />The raw data contain monthly values for 28 stations throughout the Colorado <br /> <br />River Basin (see Table 111-5). The data are complete for all stations over the <br /> <br />period 1906..1977 so' this period was selected to use for modeling. <br /> <br />It is worth noting that the hydrologic record on the Colorado River is <br /> <br />short. Generally, accurate flows are not available prior to 1906, although some <br /> <br />data are available from as early as 1896. During the period from roughly 1903 <br /> <br />through 1930 the Colorado river experienced very high flows. Examination of <br /> <br />tree rings indicate that these flows may represent the wettest period in the <br /> <br />last 600 years (Stockton and Jacoby, 1976). <br />