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Improved Inlets <br />Culvert capacity may be increased through the use of special inlet designs. <br />The Federal Highway Administration has developed extensive data19,14 on <br />these. While these designs increase the flow, their use has not been as <br />xpected. The increased costs of the special treatments is apparently respon- <br />sible. 34 /MAx oxret = 1,5 <br />�w TT <br />w.000 AawF C - <br />E T 6,000 LOSS COMICIENT K, (i f <br />E I 6.000 FOR VARIOUS ENTRANCE t2l <br />N <br />O <br />V <br />v <br />C <br />0 <br />0 <br />N <br />46 <br />144 <br />132 <br />120 r <br />0 <br />d <br />Los c <br />s6 � <br />N <br />64 <br />72 <br />c <br />- 60 <br />O <br />54 <br />U 6, <br />O <br />42 <br />E <br />r 36 <br />(.0 <br />HEADWATER DEPTH FOR <br />12 CORRUGATED STEEL PIPE CULVERTS <br />WITH INLET CONTROL <br />Figure 3.28 Inlet control nomograph for corrugated steel pipe culverts. 13 The <br />manufacturers recommend keeping HW /D to a maximum of 1.5 and preferably to no <br />more than 1.0 for diameters greater than 4 to 5 feet. <br />Revised June 2011 (TR -60) Attachment 2.05.3(3) -1 -66 <br />