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• Return Period/Precipitation <br />• Hydrograph Response Shape <br />• Drainage Basin Area <br />• Time of Concentration <br />• Curve Number <br />Precipitation Distribution A precipitation distribution is input to model the runoff hydrograph. <br />SEDCAD+ allows the user to choose between the SCS Type I and Type II storms. For the <br />Raton Creek Mine Area the SCS Type II Storm is input. <br />Storm Duration A storm duration of 24 hours is used for design of structures at the Raton <br />Creek Mine. <br />Return Period/Preci itp anon A precipitation amount is required for the appropriate return <br />period. The following precipitation values were used: <br />100-year, 24-hour even[ 4.6 inches <br />25-year, 24-hour event 3.6 inches <br />10-year, 24-hour event 3.2 inches <br />Precipitation values were obtained from the "NOAA Atlas 2, Precipitation Frequency Atlas of <br />the Western United States, Volume 3, Colorado." <br /> <br /> <br />A:~B56ATRn.REV <br />miovvJ «.m 358Rd Revised -June 1993 <br />