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• Where: ~ =representative slope length (ft) <br />m = 0.6 for Slopes > 10% <br />m = 0.5 for 4%<Slope<10% <br />m = 0.4 for Slope = 4% <br />m = 0.3 for Slopes <4°~ <br />Slope Factor is a piecewise linear relationship with the slope breakpoint <br />being at 8°~ as shown on Figure 5.5, Slope Factor for the Revised Universal <br />Soil Loss Equation, contained in the SEDCAD+ Users Manual. <br /> <br />The sedimentgraph is then routed to a structure using an exponential decay <br />procedure incorporating deposition of a particle size distribution. The eroded <br />particle size distribution is an input item. <br />SEDCAD+ Sedimentology Inputs <br />Inputs to the Sedimentology component of the SEDCAD+ computer model <br />include: <br />• Particle Size Distribution <br />• Runoff Volume <br />• Peak Discharge <br />• Soil Erodibility Factor <br />• Representative Slope Length <br />• Average Slope <br />• Control Practice Factor <br />• Sediment Specific Weight <br /> <br />Particle Size Distribution. SEDCAD+ provides a default particle size distribution <br />for both undisturbed and disturbed soils. These default distributions were derived <br />using a number of gradation curves from around the United States for disturbed <br />and undisturbed soils. They are intended to be typical representative curves. <br />The default distribution representing undisturbed soils was utilized for undisturbed <br />and reclaimed areas. <br />7 <br />