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r~ <br />L <br />• <br />• <br />APPENDIX 2.05.3-5B (Continued) <br />Riprap - Culvert No. 10 <br />Da = 1.5 Q = 4.38 Yt = .54 <br />Yt = 54 = ,36 <br />1~ I :3 <br />D = ~~ = 2.38 <br />Type L = 9" D50 <br />Expansion Factor (1/2 tan 8) <br />D~3 =.~ = 1.59 <br />1/2 tan 0 = 6.0 <br />Distance of riprap <br />At=Q~=~~ =1.46 <br />L = (~ tan 6) ~ - 1) <br />L = ( 6 ) ~~ - 1 <br />L = (6)(2.70-1) <br />L = 10.20 <br />Da = pipe diameter in feet <br />S =slope <br />Yt = tailwater depth in feet <br />Q =peak discharge (cubic ft./second) <br />Y =velocity <br />At = cross-sectional area (ft2) <br />L =riprap channel length (ft-) <br />- 236 - <br />(Rev. 5/861 <br />