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Page 4 of 4 <br />• SEDII4ENT POND 02 FILL AREA SIZING <br />Pond Location on Disturbance Area Map 5-1. <br />Principal Spillway = 9.0 ft. higher than bottom of chaanel <br />Emergency Spillway 15 ft. X 1 ft. (previous sheets) <br />Volume required to retain 10 year - 24 hour storm runoff 3.09 ac-f t. <br />Pond will be right frustrum of pyramid with dimensions: <br />B1 = upper base = 250 ft. long X 80 ft. wide <br />B2 = lower base 250 ft. long X 61 ft. wide (1:1 side slopes) <br />h = 9.0 ft. <br />V 1/3 h (BI + 82 + SB1B2) <br />V = 1/3 (9.0 ft.) (20,000 sq. ft. + 15,250 sq. ft. + 305,000,000 ft.4) <br />V = (3.07 ft.) (52,714 sq. ft.) <br />V = 158,142 cu.-f t. <br />V = 3.63 ac.-ft. <br />• <br />Inlet Slope = 10 ft. h 9.5 ft. v 1:1 <br />To be Rip-rapped. <br />One year of sediment storage = 0.93 ac.-f t. <br />(0.93 ac.-ft.) 43,560 cu. ft./ac.-f t. _ (61 ft.) x (250 ft.) (X ft.) <br />40,510.8 cu. ft. .._. 2.66 ft. <br />(61 Ft.)(250 ft.) <br />Clean pond yearly or whenever sediment depth is 2.5 ft. Install 12 inch I.D. <br />plastic pipe with screw cap at outlet noc less than 2.5 ft. above pond bottom <br />at inlet. See Sediment Pond Figures in Appendix 5-2. <br />• <br />