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:i3 Ase-3 <br />68.77 = 1.49 C6D + 1.5d21(6d + 1.Sd2)(0.0305)~ <br />0.05 ` 6 + 3.6d / <br />' 68.77 x 0.05 = 13.21 = (6d + 1.Sd2)16d + 1.Sd21 <br />1,49 x 0.03 1L 6 + 3.6d 1 <br />Solving for d yields: d = 1.51' <br />Area = (6d + 1.Sd2) = 12.48 ft2 <br />Q = AV V = Q 68.77 <br />A 12.48 <br />Velocity = 5.51 ft/sec <br />Channel in 4.948 slope: <br />Q100 = 1.49 ( 6d + 1.Sd2)2~'(6d + 1.Sd2)(0.0494)~ <br />0.05 6 + 3.6d <br />10.38 = (6d + 1.Sd2) (6d + 1.Sd2)Zis <br />6 + 3.6d <br />Solving for d yields d = 1.32 <br />Area = 10.53 <br />Velocity = 6.53 ft/sec <br />• Culvert Sizing @ 74 + 10 <br />The culvert @ 74 + 10 is designed for a 10-year <br />event where: <br />Diameter = 30 inches <br />Q10 = 19.26 Road elevation = 5237 <br />HW/D = 0.97 invert elevation = 5233 <br />Check for Q100 = 68.77 feet w/Ke = 0.5 <br />HW/D = 3.6 3.6 x 30 = 9' HW <br />12 <br />Need larger culvert since total available head = 5.7feet <br />Try 42" culvert HW = 1.3 diameter <br />HW = 4.55 ft. <br />Check for pipe capacity @ slope = 0.0305 ft/ft <br />Q = 90cfs <br /> <br />.~ <br />a~~ ~ L w <br />