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• SEDIMENTATION POND HYDROLOGY AND SEDIMENTOLOGY CALCULATIONS <br />SEDIMENTATION POND H - SUBWATERSHED Hla <br />Hydrology Input Values <br />Precipitation Distribution SCS - Type II <br />Storm Duration (hours) 24 <br />Precipitation Amount <br />10-year, 24-hour event (inches) 1.7 <br />25-year, 24-hour event (inches) 2.0 <br />Hydrograph Response Shape Fast <br />Drainage Basin Area (acres) 12.22 <br />Time of Concentration, TC (hours) 0.104 <br />Curve Number 90 <br />Routing Coefficients <br />Muskingum's K (hours) 0 <br />Muskingum's X 0 <br />Sedimentology Input Values <br />Particle Size Distribution Disturbed <br />Soil Erodibility Factor, K 0.28 <br />Representative Slope Length (feet) 100 <br />Average Slope (%) 25 <br />Control Practice Factor, CP 0.90 <br />Rainfall Factor, R <br />Average Annual 16.5 <br />Average Storm (10-year, 24-hour) 14.0 <br />Sediment Density (lbs/cu. ft.) 155.78 <br />Results at Subwatershed Outlet <br />Peak Discharge (cfs) <br />10-year, 24-hour event I0.75 <br />25-year, 24-hour event 13.67 <br />Runoff Volume (acre-feet) <br />10-year. 24-hour event 0.86 <br />25-year, 24-hour event 1.11 <br />Storm Sediment Yield (tons) <br />10-year, 24-hour event 364.84 <br />L J <br />23-72 <br />