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~~pC~i <br />discharges less than 11 m'/s so as to compare bed elevations at times of bed stability and <br />not during periods of flood scour. <br />Changes in channel width at each gage station were analyzed for measurements <br />made at discharges between 0.65 ~ duo t~es the 2-yr recurrence flood; the <br />op ,~~~ 3,30 <br />discharges were between~65 and 95 m'/s at Myton and 70 and 100 m'/s near Randlett. <br />These discharges represent conditions when the water surface is as wide as the full <br />channel and does not include flows when low elevation bars are exposed when flows are <br />overbank. <br />RESULTS <br />Channel Chara~tPristics During Flood Stagy Determined from Historical <br />Historical descriptions of high flow conditions of the Duchesne River between <br />1890 and 1930 were compiled from archival sources and personal interviews. <br />Newspaper reports are typically brief accounts of high water and times when bridges <br />were in danger {Table 2). Some floods occurred before the U.S.G.S. established gaging <br />stations, but later accounts are consistent with U.S.G.S. data. The record of peak flows <br />measured by the Geological Survey at Myton begins in 1901, and floods in 1896 and <br />1897 were only described by newspapers. The largest flood in the history of gaging <br />occurred in 1922 (362 m'/s; 12,800 ft'/s) and overbank flooding eroded new channels <br />into farmland. The recurrence of floods in i 909 and 1921 are between 15 and 25 <br />years, and these floods caused substantial channel change and the establishment of <br />23 <br />