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APPENDIX 2.05.3-5C (Continued) <br />• Riprap - Culvert No. 9 <br />Da = 1.5 <br />YT .34 <br />Yt - 34 = ,P3 <br />1S <br />Q = 1.74 = ,95 <br />T5 1, 5~5 <br />Type L = D50 9~~ <br />Expansion Factor 1/2 2 tan @ <br />Q = 1.74 = 1.74 = ,63 <br />p~~5 1~3 ~T6 <br />From figure 5-9 - 1/2 tan @ = 5.5 <br />Reference, Wright-McLaughlin Engineers, 1969 <br />Length Riprap <br />• L = 1/2 tan @ At/Yt - 1 <br />At = Q_ = 1.74 = ,87 <br />V '~6- <br />L = (6) (~T - 1) <br />_ (6)(2.56-I) <br />= 9.36 feet <br />D =pipe diameter in feet <br />Yt = tailwater depth in feet <br />Q =discharge in cubic feet per second <br />L =length of riprap <br />At = cross-section area at flow depth <br />V =velocity feet per second (fps) <br />• <br />- 244 - Rev. 5/86) <br />