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• Peak Discharge <br />10-year, 24-hour event: 2.09 cfs <br />Required Size: 12-inch CMP <br />(from Figure 1, U.S. Bureau of Public Roads Nomograph, <br />using HW/D = 1.2) <br />Actual Size: 18-inch CMP <br />POND 1 INLET CULVERT (33) <br />A 12-inch culvert functions to pass runoff from the southwest portions of <br />the raw and clean coal stockpile area, as shown on the Drainage and <br />Sediment Control Map, (Map 20). <br />Hydrology inputs and results for the contributing water sheds are shown on <br />Table 2, SEDCAD+ Version 3.0, Pond 1 and Associated Structures. <br />• Design Calculations <br />Peak Discharge <br />10-year, 24-hour event: 3.39 <br />Required Size: One 12-inch CMP <br />(from Figure 1, U.S. Bureau of Public Roads Nomograph using HW/D <br />= 1.5) <br />POND N0. 5 INLET CULVERTS <br />Two (2) culverts function as inlets to Sedimentation Pond No. 5 and pass <br />the runoff collected in the access road collection ditch located west of <br />County Road No. 92. The culvert locations are shown on the Drainage and <br />Sediment Control Map, (Map 20). The southern-most culvert is a 30-inch <br />CMP, and the other is a 24-inch CMP. Design drawings are also shown on <br />• the Sedimentation Pond No. 5 Design Map, (Map 24). <br />Hydrology inputs and results for the contributing watersheds are shown on <br />Table 11, SEDCAD+ Version 3.0, Pond 5 and Associated Structures. <br />B60\evh~9\merchBP.r., 159 R Revised, March 1992 <br />