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Ls = (L/72.6 )AM * ((430 *SA 2 + 30 *S + 0.43)/(6.613)) <br />where L and S are defined above and <br />m = 0.5 if S = >5 %; = 0.3 if S <= 3% ; = 0.4 otherwise. <br />Gross Erosion, E (tons /acre /year) : Calculated from the above defined parameters <br />for each area defined. If the user selects an area from screen, E is calculated <br />in each grid and the cumulative value is calculated. <br />E = R * K * Ls * C * P , where all the parameters are as defined above <br />Volume Calculations: <br />Required User Input <br />Sediment Delivery Ratio (DR) : Default = 0.37 <br />Time Period,T (years) : Time of analysis; typically the time of the storm event <br />Density of the sediment (D) : The post- deposit density of the sediment <br />Runoff (1) : Calculated from some other routine like Curve Number and Runoff <br />Total Erosion (E, tons /year) = Sum of (E * Area) for all the areas. <br />Total Yield (Y, tons /year) = E * DR <br />Sediment volume per year (Vs) = Y / Density <br />Total Sediment Volume = Vs * Time period <br />Runoff Volume = Runoff (1) * Total Area <br />Total Pond Volume = Runoff Volume + Total Sediment Volume <br />Attachment 2.05.3(3) -21 -28 <br />