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r <br /> AUSTIN ROAD LANDFILL <br /> i <br /> EROSION CONTROL ANALYSIS USING UNIVERSAL SOIL LOSS EQUATION <br /> 1 <br /> 1 <br /> PURPOSE:The purpose of this analysis is to predict annual soil loss from the final closure of the <br /> Austin Road Landfill and to perforin a preliminary evaluation of erosion control measures. <br /> UNIVERSAL SOIL LOSS EQUATION <br /> The LISLE calculates annual erosion rates by: <br /> A=R*K*LS*C*P <br /> ! Where: <br /> A=annual soil loss due to erosion(tons/unit area) <br /> a <br /> R=rainfall factor <br /> K=soil erodibility factor <br /> I LS=topographic factor derived from slope length and slope gradient <br /> C=cover and management factor,measures the combined effect of all the interrelated cover and management variables, <br /> non—structural methods for controlling erosion <br /> t <br /> P=support practice factor,measures the combined effect of all support practices and management variables, <br /> R structural methods for controlling erosion <br /> R is assumed to be 7 AS recommedned by the USDA Soil Conservation service,Stockton,CA <br /> K is 27 assuming on site soils with compost are used and based on Nomograph Fig.7 attached <br /> IS is calculated in the spreadsheet <br /> ESTIMATED ANNUAL SOIL LOSS FOR FINAL COVER <br /> CASE 1:TOP OF LANDFILL, DITCHES @ 300', 5%SLOPE,60%AREA WITH ESTABLISHED GROUND <br /> COVER(C= .05), CONTOUR FURROWED SURFACE(P- A <br /> ' R K L s S M(1) 1 LS(2) C P A(3) AREA TOTAL <br /> (FE9D FT/ DEGREES S/AC ACRES TONSIYR <br /> 7 0.28 300 0.05 2.86' 0.50 0.93 0.05 0.5 0.0 13816 <br /> CASE 2:SIDE SLOPE,DITCHES @ 200',25%SLOPE,60%AREA WITH ESTABLISHED GROUND COVER <br /> (C:.05),SILT FENCES (P: .5) <br /> R K L s S M(1) LS(2) C P 1%%-?l AREA TOTAL <br /> FE FT DEGREES ONS/ACRE/Y ACRES �T6�iiYR0.28 2001 0.25 14.04 0.60 9.22 0.05 0.5 0.5 46 <br /> a <br /> ANNUAL TOTAL FOR LANDFILL 27 TONS/YR <br /> WEIGHTNOLUME 100 LBS/FT-3 <br /> SEDIMENT POND CAPACITY USED (4) 20 CY PER YEAR <br /> { EQUATIONS: <br /> 1) 0.6*(1—@EXP(-35.835*s)) <br /> 2) (U72.6)^M*((65.41*@SIN(S*@PI/180)^2)+(4.56*@SIN(S*@PI/180))+0.065) <br /> I3)R*K*LS*C*P=A(Soil loss in Tons/Acre/Year) <br /> i <br /> 4)CY/YR=TONS/YR*2000 LBS/TON/LBS!FT^3/27 FT^3/CY <br /> i <br /> PRNTED:10—Dec-92 FILE C:WUSTINIUSLE.WK3 ENGR MU(R.W.BECK) PAGE 1 <br />