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• Where: Y <br />V <br />ao <br />K <br />LS <br />CP <br />Sediment yield in tons <br />= Runoff volume in acre feet <br />= Peak discharge in cfs <br />Soil erodibility factor <br />= Representative length-slope factor <br />= ConVOI practice factor <br />The new length-slope factor for the RUSLE subroutine is as follows: <br />LS = ~ '" x (slope factor) <br />72.6 <br />Where: ~ =representative scope length (ft) <br />m = 0.6 for Slope > 10% <br />m = 0.5 4%<slope<10% <br />m = 0.4 Slope = 4% <br />m = 0.3 Slope c4% <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 <br />Universal Soi( Loss Equation, contained in the SEDCAD+ Users Manual. <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 cdmponent 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 />7 <br />