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i <br />SEDIMENT CONTROL DESIGN <br />CARBON JUNCTION MINE <br />OARRIDGE ENERGY, INC. <br />• <br />NAME OF BTRUCTURE: East Collection Ditch <br />TYPE OF BTRUCTURE: Disturbed runoff collection. <br />LOCATION: East and Houth of Equipment Storage Area. <br />BTORM TYPE: 10 yr. 24 hr event <br />HA$IC DATA <br />1. PRECIPITATION EVENT: 2.25 in <br />2. WEIGHTED SOILS COMPLEX NO: 90 <br />3. LENGTH: 1250 ft. <br />4. AREA; .025 sq. mi. <br />5. SLOPE: 1$ <br />6. HYDRAULIC LENGTH: 1250 ft. <br />7. RUNOFF: 1.31 in <br />8. TIME CONCENTRATION, HOUR .14 <br />9. PEAK DISCHARGE PER UNIT: 900 c fs/in/sgmi <br />10. TOTAL PEAK DISCHARGE: 29.47 Cfs <br />STRUCTURE DESIGN <br />1. LENGTH: 1250 ft. <br />2. WIDTH: 8 ft. <br />3. HEIGHT: 2.0 ft. <br />4. FLOW DEPTH AT PEAK DISCHARGE: 0.98 ft. <br />5. SAFETY FACTOR, BOTTOM: OK <br />6. SAFETY FACTOR, SIDES: OK <br />7. WALL SLOPE: 1V:3H <br />8. VELOCITY: 3.75 fps <br />9. D/50: 2.0 <br />DESIGN: Ditch 2.0 feet deep, 8 feet wide <br />with 1V:3H side slopes. <br /> <br />