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• <br />Table 2. Peak Flow Estimates for Existing Regulated Conditions on Major Tributary Streams, Green River Basin. <br />DRAF17 February25, 1998 <br /> Y River L. Snake River Duchesne River Wbite River Price River San Rafael River <br />Recurrence <br />Interval, Years Peak Flow <br />R'/s Peak Flow <br />tt'/s Peak Flow <br />Fels Peak Flow <br />fl'/s Peak Flow <br />ft'/s Peak Flow <br />R'/s <br />2 10,100 4,900 3,800 3,900 4,100 1,600 <br />5 13,000 7,300 6,600 5,400 6,900 2,400 <br />10 14,800 8,900 8,200 6,400 8,700 3,000 <br />25 16,900 11,100 10,100 7,600 10,800 3,700 <br />50 18,400 12,700 11,300 8,400 12,200 4,200 <br />100 19,900 14,500 12,300 9,200 13,500 4,800 <br /> <br />0 Channel Hydraulics <br />Flow Routing <br />The results available for monitoring of the Green River during the runoff season in 1996 indicate <br />several key findings regarding flow routing. First, for flows in the range of 12,000 ft3/s to 18,000 <br />ft3/s, the travel time from Jensen to Stillwater Canyon is approximately 85 hours and the mean <br />velocity is about 1.1 m/s. Secondly, for flows from 5,000 ft3/s to 12,000 ft3/s, the travel time <br />between the same two points is approximately 100 hours with a mean velocity of 0.9 m/s. Third, <br />downstream from Jensen, the Green River is a gaining river, that is, average discharge increases <br />with distance downstream from Jensen. Fourth, the sharp peak discharge at Jensen flattens and <br />increases in duration with the inflows from the White and Duchesne Rivers (FLO Engineering, <br />Inc., 1997a). <br />Floodplain Inundation <br />The occurrence and properties of flooded bottomlands are largely a function of discharge <br />magnitude and channel morphology. The interaction between the river and the bottomlands can <br />be affected by presence of levees or other barriers. The duration of flooding is the period during <br />which a flooded bottomland area maintains connectivity with the river. Ponded water remaining <br />in depressions after the recession of the flood is not considered in the flood duration analysis nor <br />is water ponded by seepage. Sedimentation and erosion processes in the channel can affect the <br />9