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Ro ~ h ga Di ~h and C' ilyPrt <br />The southeast ditch and culvert are shown on the Loadout Area <br />Surface and Groundwater Hydrology Map, (Map 13), are designed to <br />collect and route runoff from the area south of the tracks to <br />Sediment Pond 1. The ditch and culvert are designed to safely <br />pass runoff from a 10-year, 24-hour event. The ditch is designed <br />as a triangular channel with 2H:lV side slopes. The culvert will <br />be placed under the existing railroad tracks. For design details <br />refer to the East Loadout Area Pond L1 and Structure Design Map, <br />(Map 26). <br />DPCign Calrnla ions <br />Hydrology <br />Hydrology Inputs <br />For all hydrology inputs refer to Table 23a, SEDCAD+ Version <br />3.0, Pond L1. <br />Hydrology Results <br />Peak Discharge <br />10-year, 24-hour event: 6.50 <br />Ditch Design <br />The southeast Ditch for the East Loadout was designed using <br />Manning's Equation for Open Channel Flow and the results are <br />shown on the East Loadout Area Pond L1 and Structure Design <br />Map, (Map 26). <br />Culvert Design <br />The culvert was sized using the Bureau of Public Roads <br />Nomograph assuming a Hw/D = 1.5. According to the nomograph <br />one 18-inch culvert or two 12-inch culverts will be <br />required. <br /> <br />"`"'°""-'" i77 Revised June 1997 <br />o:n a,s~ m:em. .•v <br />