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<br />;- 't <br /> <br />CWCB Hydrologic Summary <br />ELK RIVER NEAR MILNER, COLORADO <br /> <br />Discharge-Frequency Estimates <br />Drainage Area = 415 square miles <br /> <br /> Flood Frequency Regression <br /> Analysis Equations <br /> Computed Computed <br />Frequency Discharge (cfs) * Discharge (cfs)" <br />2 4,030 2,030 <br />5 4,770 2,810 <br />10 5,180 3,330 <br />20/25 5,520 (20-yr) 3,980 (25-yr) <br />50 5,920 4,420 <br />100 6,190 4,500 <br />200 6,450 5,100 <br />500 6,750 5,880 <br /> <br />· Statistical analysis using 20 years of stream gage data for the Elk River near Milner <br /> <br />.. Regression equations for the Northwest region using "Analysis of the Magnitude and <br />Frequency of Floods in Colorado" (USGS, 1996 Draft) <br /> <br />.June 3, 1997 .. i . . .. Estimated . Estimated <br />Peak Flow Flood Flood <br />Estimate (cfs) Description of Flow Estimate .' Frequencyl Frequency2 <br />5,370 USGS gaged flow > 1 O-year >200-year <br />5,770 Gaged flow + 400cfs overbank flow <50-year >200-year <br />6,200 Preliminary USGS estimate based on field > 1 OO-year >500-year <br /> investigation and tape-down measurement <br />6,600 Field estimate + 400 cfs overbank flow >200-year >500-year <br /> <br />June 3, 1997 Flood Event <br /> <br />1 Based on discharge-frequency values using statistical analysis of gaged data. <br /> <br />2 Based on discharge-frequency values using regional regression equation results. <br />