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T <br />KAISER STEEL CORPORATION <br />COLORADO COAL MINE COMPANY <br />COUNTY ROAD DRT CROSSING <br />DITCH AND RIPRAP SIZING <br />TABLE 1 <br />DRAINAGE AREA = 46 ACRES <br />PEAK DISCXARGE 10-YEAR STORM = 27.6 CFS <br />PEAK DISCXARGE TAKEN FROM E%NIBIT 9, COLORADO COAL MINE NO 1 PERMIT <br />CREEK CHANNEL SIZING <br />INPUT DATA: <br />PEAK DISCXARGE 100-YEAR STORM 28 CFS <br />SLOPE OF DITCH 0.4 X <br />NANNINGS NUMBER 0.035 <br />YIDTH OF BOTTOM OF DITCH 12 FT <br />DITCH SIDE SLOPES 4 :1 <br />DEPTX OF FLON 7 FT <br />OUTPUT DATA: <br />AREA OF FLON 16.0 SOFT. <br />NETTED PERIMETER 20.2 FT <br />XYDRAUIIC RADIUS 0.79 FT <br />VELOCITY 2.3 FPS <br />DISCHARGE 36.8 CFS <br />PAGE 1 <br />