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<br />001025 <br /> <br />A comparison of the 1983 estimated runoff with the frequency-discharge <br /> <br />curves indicates that a flood peak of 1300 cfs on the Eagle River and <br /> <br /> <br />Gore Creek upstream of Dowds Junction was equivalent to about a one in <br /> <br />3-year flood event. and 2450 cfs downstream was equivalent to about a <br /> <br />10-year flood event, The sudden jump in flood magnitude downstream is <br /> <br />due to the almost simultaneous arrival of the flood peaks at the <br /> <br />confluence, A comparison of frequency-discharge curves with gage data <br /> <br />for the Eagle River at Gypsum indicated the peak during the 1984 runoff <br /> <br />was about a 20-year event. <br /> <br />Knowledge of the maximum volume of water that may flow into a dam <br /> <br />site is useful in predicting highest reservoir elevation under the worst <br /> <br />case scenario, Knowledge of the peak rate of flow into the site is <br /> <br />useful in determining the time it might take to fill the reservoir and <br /> <br />predict the available evacuation time, <br /> <br />Using the projected hydrographs for the Eagle River at Dowds Junction <br /> <br />for the four month period from May 1st through August 31, 1983, the <br /> <br />following volumes of water passed into Dowds Junction: <br /> <br />/ <br />i <br />... <br /> <br />Eagle River only <br />Eagle River and Gore Creek <br /> <br />92.455 Acre-feet <br />186.645 Acre-feet <br /> <br />The peak rate of inflow on the Eagle River was 2590 acre-feet per day <br /> <br />upstream of the junction and a total of 4862 acre-feet per day from both <br /> <br />the Eagle River and Gore Creek, <br />