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<br />o <br />o <br />('") <br />m <br />-.1 <br />'" <br /> <br />4.3 <br /> <br />MODEL VERIFICATION <br /> <br />The model was initially applied to historic conditions using the appropriate operation rules <br /> <br />for calibration purposes. The basic input data used were virgin flows (historic fiows adjusted for <br /> <br /> <br />depletions due to diversions and reservoir operations) and estimated or recorded diversion data <br /> <br />discussed In Chapter 3. The recorded and simulated flows at several locations of the Colorado River <br /> <br /> <br />were compared, They are presented in Table 4.4. The historic and simulated reservoir contents for <br /> <br /> <br />Green Mountain Reservoir were also compared. They are shown in Figure 4.1. In both cases, the <br /> <br />simulated results are in good agreement with recorded data. Some discrepancies in the Green <br /> <br /> <br />Mountain Reservoir contents during April through June were due to difficulties in duplicating <br /> <br />historical power release schedules which were highly variable during this period. This monthly <br /> <br />difference has no impact on the total seasonal releases of the model. <br /> <br />TABLE 4.4 <br /> <br />COMPARISON BETWEEN AVERAGE <br />ANNUAL RECORDED AND SIMULATED FLOWS <br />(1973 - 1983) <br /> <br />GAGE <br /> <br />RECORDED <br />11000 afl <br /> <br />SIMULATED <br />11000 af) <br /> <br />Colo. R. at Sulfur Springs <br /> <br />174 <br /> <br />174 <br /> <br />Fraser R. at Granby <br /> <br />101 <br /> <br />101 <br /> <br />Biue R. below Green Mtn. Reservoir <br /> <br />293 <br /> <br />290 <br /> <br />Colo. R. near Kremmling <br /> <br />712 <br /> <br />728 <br /> <br />Colo. R. near Dotsero <br /> <br />1,509 <br /> <br />1,496 <br /> <br />Colo. R. near DeBeque <br /> <br />2,647 <br /> <br />2,642 <br /> <br />Colo. R. near Cameo <br /> <br />2,727 <br /> <br />2,724 <br /> <br />In addition to the above comparison of average annual quantities, the comparison was also <br /> <br /> <br />made between recorded and simulated flows on a monthly basis. The discrepancies were generally <br /> <br />less than 5 percent. <br /> <br />4-8 <br />