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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 (I) :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, Ions/year) = E * DR <br />Sediment volume per year (Vs) = Y /Density <br />Total Sediment Volume = Vs 'Time period <br />Runoff Volume =Runoff (I) * Total Area <br />Total Pond Volume =Runoff Volume + Total Sediment Volume <br />Enclosed on the following pages are the volume calculations for each pond. Map 2.05.3-13 shows <br />the detailed plan views and cross-sections for all ponds. All ponds will utilize a keyway cut into the <br />dam and seep collars on the principal spillway pipe as shown on the map. All dams will have a <br />combined slope of 5.0:1.0 and wiN be compacted in no greater than 8" lifts to 90% of the tested <br />maximum dry density of the material. All ponds will also be marked on site with a graded vertical <br />rod which marks the 60% cleanout level for sediment collection. This level is defined as 60% of the <br />calculated 3 year sediment volume. The pond will be Cleaned out when the sediment reaches this <br />level. <br /> <br />(Revised 12/00J Attachmen! 2.05.3(3) -10-7 <br />