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Gross Erosion, E (tons /acre /year) : Calculated from the above defined parameters for each <br />area defined. If the user selects an area from screen, E is calculated in each grid and the <br />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 />Pond 008 was constructed in the fall of 2000. Pond 009 was excavated in the spring of <br />2002. Pond 012 was excavated in Spring 2005. Ponds 011 and 013 were constructed in <br />late 2007. Pond 014 was constructed in Spring 2004 and reclaimed in Fall 2009. Pond 015 <br />was constructed in 2011. Accordingly, the values for Ponds 008,009, 011, 012, 013 and <br />015 are as- built, Map 2.05.3(3) -6 -1 shows the detailed plan views and cross - sections for <br />ponds 012 and 013. All ponds will utilize a key cut into the dam and seep collars on the <br />principal spillway pipe as shown on the map. All dams will have a minimum combined slope <br />of 5.0:1.0 and will be compacted in no greater than 8" lifts to 90% of the tested maximum dry <br />density of the material. Pond 015 was dug in near solid rock and the embankment side is <br />steeperthan 5HAV. <br />(Revised August 2011) 2.05.3(3) -19 <br />