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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 />62 <br /> <br />Gunnison River, and 450 cms (15,900 cfs) below the confluence. This flow is <br />-3.0 times the mean annual flow. Significant movement of the bed material <br />occurs at a discharge of 625 cms (22,000 cfs) above the Gunnison, and 1,000 cms <br />(35,300 cfs) below its confluence. A flow of this magnitude is at least as-year <br />flood. Peak flows in 1993 exceeded 1200 cms (44,000 cfs) and it was evident that <br />gravel movement was wide spread and that fine sediment was winnowed <br />from the bed. Our analysis of the downstream hydraulic geometry of the 57 <br />mile reach indicates that the flow modeling sites are generally representative <br />of the entire reach. <br /> <br />Acknow led gmen ts <br />This research was supported by the u.S. Fish and Wildlife Service, Colorado <br />Water Resources Research Institute, and the National Science Foundation. <br />We especially thank Doug Osmundson, Frank Pfiefer, Chuck McAda, and <br />others at the Grand Junction office of the U.S. Fish and Wildlife Service for <br />their generous contributions of time and equipment. We would also like to <br />thank Keith Kisler, Margaret Franseen, and David Pritham for help with data <br />analysis and field work. <br />