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<br />327 <br /> <br />geomorphic events for streams in which the more frequent floods are insuffi- <br />cient to transport the available bed material. Although bed material in the <br />Little Snake River near Dixon is very coarse, the less f~quent floods do not <br />appear to be geomorphically important. As noted above, the largest recorded <br />flood in the Little Snake near Dixon occurred in 1920 and had a recurrence <br />interval of approximately 75 years. It is unknown what immediate effects <br />this flood had upon the stream channel. In any case, neither this flood nor <br />previously unrecorded floods appear to have affected the bankfull stream <br />channel as it was in 1977. <br />The effective and bankfull discharges of the 15 Yampa River basin gaging <br />stations are listed in Table I, columns 7 and 9, and compared in Fig. 11. The <br /> <br />300 <br /> <br /> <br />1 5 10 50 100 300 <br />EFFECTIVE DISCHARGE. IN CUBIC METERS PER SECOND <br /> <br />100 <br /> <br />Cl <br />Z <br />Cl <br />u 50 <br />UJ <br />Vl <br />a: <br />UJ <br />a.. <br />Vl <br />a: <br />UJ <br />I- <br />UJ <br />:i: <br />u <br />~ 10 <br />u <br />z <br /> <br />W 5 <br />(.:l <br />a: <br /><l: <br />:r <br />u <br />Vl <br />Cl <br />-l <br />-l <br />~ <br />U. <br />><: <br />~ 1 <br />CD <br /> <br />0.5 <br /> <br />Fig. 11. Comparison of computed effective discharges with the observed bankfull dis- <br />charges at 15 gaging stations. <br />