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• SEDCAD+ Sediment Calculations <br />The sedimentotogy of each watershed was evaluated by SEDCAD+, SEDCAD+ <br />develops a sedimentgraph utilizing the Revised Universal Soil Loss <br />Equation (RUSLE). The RUSLE subroutine calculates sediment yield far <br />each subwatershed by Nilliam's Modified Universal Soil Loss Equation <br />using anew revised representative length-slope factor as follows: <br />Y 95(V x Qp)0.56K(LS)(CP) <br />Mhere: Y =Sediment yield in tons <br />V =Runoff volume in acre feet <br />Qp = Peak discharge in cfs <br />K = Sofl erodibility factor <br />LS = Representative length-slope factor <br />CP = Control practice factor <br />• The new length-slope factor for the RUSLE subroutine is as follows: <br />LS = ~ m(slope factor) <br />Mhere: ~ ^ representative slope length (ft) <br />m 0.6 for Slope >lOX <br />m = 0.5 4%<slopeSlOS <br />m ^ 0.4 Slope ^ 43 <br />m ^ 0.3 Slope 4X <br />Slope Factor 1s a plecewise linear relationship with the slope <br />break point being at 8X as shown on Figure 23-13. Slope Factor <br />for the Revised Universal Soil Loss Equation. <br />The sedimentgraph is then routed to a structure using an exponential <br />decay procedure incorporating deposition of a particle size <br />• distribution, The eroded particle size distribution is an Input item. <br />23-67 <br />