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SEDCAD+ Hvdrology Inputs <br />Inputs to the hydrology component of the SEDCAD+ computer model include: <br />- Precipitation Distribution <br />- Storm Duration <br />- Return Period/Precipitation <br />- Hydrograph Response Shape <br />- Drainage Basin Area <br />- Time of Concentration <br />- Curve Number <br />- Routing Parameters <br />Precipitation Distribution. A precipitation distribution is input to <br />model the runoff hydrograph. SEDCAD+ allows the user to choose between <br />the SCS Type I or Type II storms. For the Kerr Mine the SCS Type II storm <br />was selected. <br />Storm Duration. A storm duration of 24 hours was used for design. <br />Return Period/Precipitation. A precipitation amount is required for the <br />appropriate return period. For the Kerr Mine, the following precipitation <br />values are used: <br />Return Period <br />2-year, 24-hour <br />10-year, 24 hour <br />25-year, 24-hour <br />100-year, 24-hour <br />Precipitation (inchesl <br />1.2 <br />1.7 <br />2.0 <br />2.4 <br />Precipitation values were obtained from the Precipitation Frequency Atlas <br />of the Western United States, Volume 3, Colorado, (NOAA, 1973). <br />r~ <br />U <br />23-62R Revised - August, 1991 <br />