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• Input Data <br />Landuse Area Rainfall Erod- Length Slope Ls Cf* Pf <br />(ft^2) Factor ability (ft) (%) <br />Pasture 5517927.0 50.0 0.37 1519.8 10.9 6.10 0.04 1.00 <br />Runoff = 0.000 inch. <br />Sediment Density = 62.400 <br />Time = 3.0 years <br />Drainage Ratio = 0.86 <br />Total Area = 5517927.021 sq.ft <br />Gross Erosion = 571.694 tons/yr. <br />Total Yield = 491.657 tons/yr. <br />Runoff Volume = 0.000 cu.ft. <br />Sediment Volume = 47274.732 cu.ft. or 1.08 acre feet for 3 years. <br />• Total Volume = 47274.732 cu.ft. ~ <br />* The Cf factor is determined from the chart on the following page, shown in Design Hydrology and <br />Sedimentology for Small Catchments by Haan, Barfield and Hayes. Based on an approximate <br />ground cover of 70% for permanent pasture, a Cf factor of 0.04 was used, which is conservative. <br />The pond volume below the primary spillway will be comprised of two design needs: 1) Pit pumping <br />requirement of 6.6 acre feet, as shown above <br />2) 3 year sediment delivery of 1.08 acre feet, as based on the calculations above. <br />This is a total volume of 7.7 acre feet. <br />As seen in the stage storage relationship, the pond has 8.72 acre feet of storage at this elevation. <br />Detention time of 24 hours is shown in the SEDCAD outputs, which are at the end of this section. <br />• <br />REVISED MARCH 2006 Attachment 2.05.3(3)-14-6 <br />