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Technical Revision 90-06 <br />~ Actual peak discharge for each storm event was calculated by multiplying the <br />• equivalent peak discharge by the corresponding watershed shape and slope <br />correction factors <br />SEDIMENTATION <br />The volume of sediment which is expected to be deposited in the drainage and sediment <br />control structures has been calculated using a sediment delivery ration based upon the <br />drainage area and the "Universal Soil Loss Equation" <br />A=RKLSCP <br />where: <br />A =sediment yield in tons/acre/year <br />R =rainfall factor <br />K =soil erodibility factor <br />LS =slope length gradient factor <br />C =crop management factor <br />P =erosion control factor <br />• The SCS publication "Predicting Rainfall Erosion Loss" =Handbook No. 537, was utilized as <br />a guideline in determining appropriate values for the noted variables in the Universal Soil Loss <br />Equation"; <br />~ The rainfall factor "R" was obtained from the Figure entitled "Average Annual <br />Value of Factor R" in SCS Handbook No. 537 <br />~ The Soil Erodibility Factor "k" is obtained from the Mine No. 3 Soils Map and <br />SCS "K" Factor tables -the value is based on soil types clay, clay loam, loam <br />and silty clays <br />L J <br />TR 90-06 Exhibit 3 - 8 Revised 11 /16/90 <br />