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• The new length-slope factor for the RUSIE subroutine is as follows: <br />IB = l m x (slope factor) <br />72.6 <br />1 = representative Slope length (ft) <br />m = 0.6 for Slopes > 10$ <br />m = 0.5 for 4$GSlope<10$ <br />m = 0.4 for Slope = 4$ <br />m = 0.3 for Slopes <4$ <br />Slope Factor is a pieoewise linear relationship with the slope breakpoint <br />being at 8$ as shown on Figure 5.5, Slope Factor far the Revised Universal <br />Soil Loss Equation, contained in the SEDCADf Users Marn~al. <br />Zhe sed?~~t graph is then zuited to a structure using an exponential <br />decay prncedune incorporating deposition of a particle size distribution. <br />Zhe eroded particle size distribution is an input item. <br />SEDCAD+ Sedimentology Inputs <br />Irgxrts to the sedimentology ooaponent of the SEDCADt oaiputer model <br />include: <br />• Particle Size Distribution <br />• Runoff Volume <br />• Peak Di ~*~ <br />• Soil Erodibility Factor <br />• Represeirtative Slope TP* ~+*h <br />• Average Slope <br />• Contrrol Practice Factor <br />• Sediment. Specific Weic~t <br />Particle Size Distribution. SEDCAIN- provides a default particle size <br />distribution for both tiudisturbed and disturbed soils. 7.hese default <br />distributions .ere derived using a number of gradation curves from anxud <br />the United States for disturbed and tudisturhed soils. 'n~ey are ;*+*~TM~ <br />to be typical representative curves. <br />Runoff Volume. V. Runoff volume is calculated by SEDCADF as previously <br />described in the SEDCAD~ Calculations portion of the Hydrology section, <br />and is considered ko be an internal input. <br />.:,..a„~~wm 14Rb Revised -April 1992 <br />~~ <br />