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<br />. <br /> <br />. <br /> <br />. <br /> <br />Comparison of Flow Estimates <br />Clear Creek at Silver Plume, Colorado <br />(Drainage Area = 44.9 square miles) <br /> <br /> Unit <br /> Peak Flow Flow Discharge <br />Methodolol!V Estimate lcfs) Freouencv lcfslsQ mile) <br />"Manual for Estimating Flood Characteristics 950 l00-year 21 <br />of Natural Flow Streams in Colorado" (TM-l, <br />USGS/CWCB, 1976) <br />CWCB regional regression analysis: 875 l00-year 19 <br />Based on published flow values for streams in <br />the mountain areas of the South Platte River <br />basin, drainage areas less than 147 square <br />miles (CWCB, 1997) <br />"Guidelines for Determining l00-year Flood 800 l00-year 18 <br />Flows for Approximate Floodplains in <br />Colorado" (CWCB, 1996) <br />Log Pearson 3 Flood Frequency Analysis using 885 l00-year 20 <br />transposed annual peaks from Lawson gage <br />(CWCB,1997) <br />Combined-population snowmelt/rainfall 1,400 lOO-year 31 <br />discharge frequency analysis (Corps of <br />Engineers, 1990) <br />"Analysis of the Magnitudes and Frequencies 990 lOO-year 22 <br />of Floods in Colorado," Draft (Ed Vaill, <br />USGS) <br />"Estimation of Natural Streamflow 930 l00-year 21 <br />Characteristics in Western Colorado" (USGS, <br />1985) <br />Maximum paleoflood estimate (+1- 20%) on 950 Max. 21 <br />Clear Creek between Georgetown and Silver paleoflood, <br />Plume (USGS/CWCB, 1997) frequency <br /> not <br /> assigned <br />Estimated 1995 peak flow for Clear Creek 600 Actual 13 <br />at/near Silver Plume (Average of USGS and flood event, <br />other sources). frequency <br /> not <br /> assigned <br />