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~' Volume capacity for t!~r. as-built c'~annel a*. the design flow depth is less than <br />7910 CFS (100 YR - "c4 HR eve~:t), try d = 10.5 <br />d 10.5 FT ~' <br />A K(10.5)2(203) _(4(10.5)2(2.84) +(10.5)(21.0) , <br />A = 488.96 FT2 <br />R = A/WP = 6.40 FT <br />V = 1.486/0.04 (6.15)2/3(0.0179)K <br />V 16.64 FPS <br />Q VA =(16.64)(483.96) = 8136 CFS <br />The as-built channel flowline will be near 10.5 ft. Determine superelevation on <br />bends (200' radius) to see if rip-rap height is O.K. <br />Superelevation = oY CV2W%gr <br />oY = (1.0)(1G.64)2(72.14)/(32.2)(200) <br />nY 3.1 FT <br />Compare flowline height on curves with as-built rip-rap height. <br />d+oY=10.5+3.1 =I3.6FT <br />O.K. <br />As-Built Rip-Rap Sizing <br />Using as-built parameters calculate D50 rip-rap size. <br />Tractive Force on Charnel Bottom <br />?'o = RS <br />?"o =(62.4)(6.4)(0.0178) = 7.11 PSF <br />to on 2.84 H: 1V Side Slopes <br />~1 70 (1 - Sin20/Sin20)0.5 <br />rl = 7.11(1 - 0.11/0.413)0.5 = 6.09 PSF <br />D50 (Straight Section) = Tl/0.04 (Xs -~ ) <br />= 6.09/0.04 (165 - 62.4) <br />I~ <br />