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CROSS-SLOPE BERM DESN April 18, 2003 Worksheet No. 1 of 3 <br /> SELECTION OF DESIGN STORM DURATION <br /> Used for maximum landfill run-off <br /> Procedure: Calculate concentration time based on longest overland path to the cross-slope berm. <br /> Time of concentration (TJ = design storm duration <br /> Time of Concentration (T,): <br /> Area I: 0.97 acres <br /> Area I1: 1.47 acres <br /> Area 111: 1.84 acres <br /> Area IV: 2.10 acres <br /> Total Area: 6.38 acres (see Drawing No. 1) <br /> Surface condition = Average Grass <br /> Overland Flow Time: <br /> Length ftSlope % Time (min) (1) <br /> Area 1: 95 6 11 <br /> 115 30 8 <br /> 19 <br /> Area 11: 165 6 13 <br /> 115 30 8 <br /> 21 <br /> Area 111: 185 6 14 <br /> 150 30 9 <br /> 23 <br /> Area IV: 165 6 14 <br /> 160 30 9 <br /> 23 <br /> Minimum Overland Flow Time = 19 min <br /> Use Tc= 15 min <br /> USE A 15 MIN. STORM DURATION <br /> (1) Source: VDH&T, Plate 5-1, attached <br /> N:\1 North County\NCDrainDesign.xls <br /> Sheet: DrainageDesign Printed:6118/03 <br />