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L <br />1 <br /> <br /> <br /> <br /> <br />LJ <br /> <br />1 <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br />~7 <br /> <br />MINE 3 <br />SEDIMENTATION POND E DESIGN SPECIFICATIONS <br />-Sedimentation pond design to contain 10-year, 24-hour event. <br />-Emergency spillway designed for 25-year, 24-hour event. <br />-Antecedent moisture condition II <br />-Weighted curve number is 82. <br />-Drainage area is 35 ac. <br />-Disturbed area is 24 ac. <br />-Runoff volume is <br />-Sediment volume 's 0.64 <br />-Total volume is 2.16 ac-ft. <br />-Emergency spillway height above bottom of natural channel is less than ten feet. <br />-Relative elevation top of dam is 102 ft. <br />-Relative elevation crest of emergency spillway is 100.5 ft. <br />-Depth of flow and velocity of flow in emergency spillway for design event is 0.5 ft. <br />and 5.2 fps respectively. <br />-Relative elevation top of decant is 100.0 ft. <br />-Relative elevation dewatering hole is.95.7 ft. <br />-Diameter of dewatering hole is 2. ~n. <br />-Total detention time is 28 hrs~ <br />WEIGHTED CURVE NUMBER: (AMC fI) <br />Total Drainage area is 35 ac. <br />24 ac. roads do parking area - CN 87 <br />11 ac. contoured range land - CN 70 <br />Weighted CN = (87 x 24) + (70 x 11) = 82 <br />35 <br />2 <br /> <br />