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<br />SEDIMOT POND DESIGN <br />Introduction <br />The design of the existing sediment ponds was evaluated and <br />modifications made if required to ensure that at a minimum the design <br />adhered to the following specifications: <br />1. Provide storage for the runoff from the 10-year, 24-hour storm <br /> event. <br />2. Receive pumpage from the pit sump fo r ground water and surface <br /> water ru noff inf lows to the active pit. <br />3. Provide an emergency spillway capable of passing runoff from the <br /> 25-year, 24-hour storm event. <br />4. Provide storage for sediment generated from at least two 10-year, <br /> 24-hour (MUSLE) storm events. <br />The fallowing narrative describes the methodology used in checking the <br />design of Sediment Ponds No. 002, 003 and 004. <br />Methodology <br />The precipitation runoff (peak flow and volume) was estimated using the <br />Soil Conservation Service (SCS) triangular hydrograph techniques as <br />described in Design of Small Dams (U.S. Dept of Interior, 1977). <br />Computations necessary for this runoff estimating technique have been <br />computerized by various individuals and agencies. <br />SEDIMOT II was developed by Research Specialist Bruce N. Wilson, <br />Professor Billy J. Barfield and Assistant Professor Ian D. Moore at the <br />Department of Agricultural Engineering, University of Kentucky, <br />Lexington, Kentucky. This program was used to estimate runoff peak flow <br />and volume which are necessary in the design of the sediment ponds. A <br />copy of the computer program's input and output file information has <br />• been included in Appendices attached to this narrative. <br />7_6_2 Revised 8/27/86 <br />