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<br />OO~725 <br /> <br />A comparison of the 1983 estimated runoff with the <br />frequency-discharge curves indicates that a flood peak of 1300 cfs on the <br />Eagle River or on Gore Creek upstream of Dowds Junction is equivalent <br />to about a one in 3-year flood event, and 2450 cfs downstream is <br />equivalent to about a 10-year flood event. The sudden jump in flood <br />magnitude downstream is due to the almost simultaneous arrival of the <br />flood peaks at the confluence. <br /> <br />A comparison of frequency <br />Eagle River at Gypsum indicates the <br />a 20-year event. <br /> <br />discharge curves with gage data for the <br />peak during the 19B4 runoff was about <br /> <br />3.3 B~nQff_~Ql~m~~ <br /> <br />Knowledge of the maximum volume of water that may flow into a dam <br />site is useful in predicting highest reservoir elevation under the worst <br />case scenario. Knowledge of the peak rate of flow into the site is <br />useful in determining the time it might take to fill the reservoir and <br />predict the available evacuation time. <br /> <br />Using the projected hydrographs for the Eagle <br />Junction for the four month period from May 1st through <br />the following volumes of water passed into Dowds Junction: <br /> <br />River at Dowds <br />August 31, 1983, <br /> <br />Eagle River only <br /> <br />92,455 Acre-feet <br /> <br />Eagle River and <br />Gore Creek <br /> <br />186,645 Acre-feet <br /> <br />day <br />both <br /> <br />The peak <br />upstream <br />the Eagle <br /> <br />rate of inflow on the <br />of the junction and <br />River and Gore Creek. <br /> <br />Eagle River was 2590 acre-feet per <br />a total of 4862 acre-feet per day from <br />