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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 data19.20 on <br />these. While these designs increase the flow, their use has not been as <br />expected. The increased costs of the special treatments is apparently respon- <br />sible. '% N MAX Wmm= /.S' I <br />lflo <br />10,000 469vE C 4N4* A7- <br />, 0,000 LOSS COEFFIGENT KQ (I ) <br />s,000 FOR VARIOUS ENTRANCE (2) <br />156 TYPES 6. <br />s,00p (3) <br />144 4.000 HW ENTRANCE 5. 6. <br />p SCALE COEff7ClENT <br />-132 3,000 1 TYK 6. <br />120 • (1) Meedwell, so,=' er 41d 0.5 <br />_a 2,000 dee% fencing low 5. <br />4. <br />too (2) Mitered le cen(erm to dew 0.7 <br />c (3) lrejecl V "m fill 0.9 3. 4. <br />3 <br />15 0.5 <br />1.0 0.5 <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 HtN/O 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 -67 <br />- 96 2 <br />1,000 <br />3, <br />T <br />vi <br />Soo TO ese icele (b Of (3) OrMect <br />- <br />84 <br />600 hwkenhry N stele (1). then <br />un "night tndined line thtewA <br />2. <br />500 o end o seole; of r~w as <br />72 <br />i11e"r/ped. <br />400 <br />2• <br />2. <br />300 <br />I.s <br />- <br />3 <br />e <br />i0 <br />200 = <br />1.5 <br />1.3 <br />O� <br />V <br />54 O <br />11 <br />100 <br />­48 <br />so <br />i0--- <br />0 <br />42 <br />4 EXAM► O <br />1.0 <br />�9- <br />E <br />30 Deem. (0) a 48in. ■ 4 f f <br />0 <br />90 <br />0. 70 W /see 3 <br />0.9 <br />33 <br />----- - - - - - -- o <br />20 = <br />0.8 <br />0.8 <br />30 <br />5cek ' "W <br />�t <br />O <br />11) 1.0 4.0 h <br />0.6 <br />27 <br />10 (2) 1.0 4.0 <br />M <br />e <br />l3) 1.1 4.3 <br />s <br />0.7 <br />0.7 <br />` <br />24 <br />a <br />0.7 <br />v <br />21 <br />0.6 <br />0.6 <br />y <br />4 <br />g <br />3 = 47e 0 QiS <br />0.6 <br />c <br />l8 <br />w <br />2 <br />15 0.5 <br />1.0 0.5 <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 HtN/O 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 -67 <br />