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<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 />I <br />I <br />I <br /> <br />sediment is temporarily stored in pool reaches and in the lee of obstructions in the channel during low flows <br />and re-entrained at higher flows. <br /> <br />Application of the incipient motion concepts to the Yampa Canyon reach found that significant <br />movement of the cobbles on the cobble bars in Yampa Canyon is a relatively rare event. Depending on <br />assumed subsurface conditions on the bars, the upper end of the range of discharges required for incipient <br />motion of the median bed material size (75 mm) on the surface at a typical site is substantially higher than <br />previously reported. This result, combined with our limited understanding of flushing flows, suggested that <br />accumulation of fine sediments at depth in the gravel! cobble substrate is typical of the Yampa Canyon reach <br />over long time periods. <br /> <br />5-27 <br />