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Table 3. Riprap Volume <br /> <br />Section Wetted <br />Perimeter(ft) <br />Thickneas(ft) <br />Length(ft) <br />Volume(ft3) <br />Yd3 <br />D50(ft) <br />B-B 35 1.0 80 2800 104 0.5 <br />F-F(Riprap) 40 2.0 30 2400 90 1.0 <br />F-F(Filter) 40 0.75 30 900 35 .03 <br />Ref: Office of Surface Mining, Septembez, 1982. Surface Mining <br />Water Diversion Design Manual. OSM/TR-82/2 <br />Table 4. Riprap Gradation <br />% Small Than Minimum <br />Given Size Dimension <br />D50(inches) (by Weight) (inches) <br />100 9 <br />6 35-55 6 <br />10 2 <br />100 18 <br />12 35-55 12 <br />10 3 <br />100 0.8 <br />0.3 35-55 0.3 <br />10 0.2 <br />