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1 <br />1 <br />1 <br />1 <br />r <br /> <br />1 <br />Winter Flow Rates <br />Daily average flow rates in the Green River throughout the winter (defined here as <br />November through March) are remarkable for their relatively small variation throughout the <br />months of November, December, January, and February as measured at the Jensen Gage <br />(Figure 4). The flow does tend to increase near the end of February reflecting the early <br />beginnings of the spring runoff. The flow continues to increase through the month of March and <br />reaches a peak in Iate May. The year-to-year variation is also relatively small (Figure 4), with a <br />difference of only approximately 3000 cfs between the 5% and 95% non-exceedence discharges <br />throughout the winter period. These relatively stable flow rates result from the upstream control <br />provided by the Flaming Gorge Dam and the very low precipitation and snowmelt rates <br />throughout the winter season in the Green River watershed downstream of the Flaming Gorge <br />Dam. <br />While the daily average flow rates show very little variation throughout the winter, there <br />' can be a relatively wide variation of flow in each individual day as a result of the operation of the <br />Flaming Gorge Dam. The dam is operated to provide power on demand throughout the day and <br />water releases from the dam can vary from a low of about 800 cfs to over 4000 cfs in a single day <br />(Valdez and Masslich, 1989). Low flows typically occur at night. Flows usually increase rapidly <br />between 0600 and 0800 hours to the maximum flow rate and flows then remain approximately <br />constant throughout the day. The flow rate usually decreases between 1800 and 2200 hours back <br />to the minimum flow. The actual flow rates reflect the power demand which may vary on any <br />given day. <br />1 <br /> <br /> <br /> <br /> <br />1 <br /> <br /> <br />1 ' <br />