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O'Brien (1993) concluded that flows of approximately 14,000 <br />cfs would be required to produce overbank flows into the wetlands <br />if the dike was removed. Figure 4 provides data on flows above <br />15,000 cfs which should predict the number of days with overbank <br />flow conditions that could potentially occur in the study area. <br />Prior to 1963 flows that could produce flooding conditions for at <br />least 10 days could have occurred every 1.6 years, and many years <br />in a row would have flooding. Since 1963 the return interval of <br />this magnitude flow has been 2.4 years. The Yampa River itself <br />produces flows of 15,000 cfs regularly, thus flows in a larger <br />river such as the Green, would be expected to be 20,000 cfs or <br />more to perform enough work to modify stream channels and provide <br />habitat conditions for native riparian plant species <br />establishment. <br />GREEN RIVER AT JENSEN <br />DAYS OVER 15, 000 CFS <br />70 <br />60 <br />50 <br />N <br />} <br />Q <br />Q 40 <br />li <br />0 <br />Q' <br />W 30 <br />Z <br />20 <br />to <br />1917 1952 - 1957 1962 1967 1972 1977 1982 1987 1992 <br />WATER YEAR <br />Figure 4. Number of days per water year with flows equal to or <br />exceeding 15,000 cfs. <br />10 <br />