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<br />' Flow Duration <br />Flow duration curves determine the average duration of a given discharge on an annual <br />basis. For the Green River gage the pre-1963 mean peak discharge of 32,700 cfs and post-1963 ' <br />mean peak discharge of 22,300 were equaled or exceeded an average of 7.3 days per year, but the <br />i discharge of 32,700 cfs now only occurs on an average of 1.8 days per year (see the FLO report, <br />1995b for the flow duration curve plots). A shift in flow duration signified by a decrease in the <br />high flow duration and a corresponding increase in the base flow duration occurs at 5,300 cfs. <br />The pre-1963 mean base flow of 2,720 cfs occurred approximately 56% of the time but now this <br />discharge occurs about 95% of the time for the Green River gage. <br />7 <br />1 <br /> <br /> <br />1 <br />~~ <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />