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• Surface Water Hydrology <br />Estimated Flood Magnitudes <br />100-Year Return Interval <br />Regression Equation:2 <br />Q = 1640 (A) x'388 <br />Variables <br />Flood Region= Plains Region' <br />A = 264 is the drainage area, in square miles, at the ungaged site <br />Q = ??? is the discharge, in cubic feet per second <br />Results: <br />Q = 14270 cfs <br />• <br />Taken from Figure 1 <br />z Taken from Table 1 for Plains Region - 100 year storm event <br />Flood magnitudes computed per methods described in Water Resources Investigations Report 99-4190, <br />Analysis of the Magnitude and Frequency of Floods in Colorado - 2000, <br />U,S. Department of the Interior, U.S. Geological Survey. <br />• <br />