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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 datal9jo on <br />these. While these designs increase the flow, their use has not been as <br />sxpected. The increased costs of the special treatments is apparently respon- <br />sible. <br />18" M IK w01R = ;2.81 <br />190-F 10,000 Arawe CuWEZT' <br />lee , 8,000 LOSS COEFFICIENT K, i I <br />e,oao FOR VARIOUS ENTRANCE f2) <br />- Ise TYPES 6. <br />s,00p (3) <br />144 4,000 t ENTRANCE 5. 6. <br />D K'1'� TYPE CCIEFFICIENT <br />132 3.000 6. <br />IZO • 111 H.w �aZ. p. d", a EMI 0.5 . <br />2.000 >� em" be to S. <br />109 <br />(M Miwo' N --Rkrw I- f14 a 0.7 4. <br />131 Mieaiiy Inw lil 0.9 3. 4. <br />I 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 -64 <br />T <br />98 <br />1.000 <br />3. <br />1%I <br />goo <br />j <br />!T <br />T* W* Kole Mw M owe*t <br />B4 <br />I <br />i i 00 r.. skwof kKhMW 4" I we"N <br />Z <br />500 0M•CKd4;ar..WMer <br />400 iRuU <br />2• <br />Tz <br />2. <br />300 p <br />c <br />tt0 <br />zoo <br />1.5 <br />I.S <br />o <br />a <br />` <br />54 0 <br />loo E.E. <br />8o 0 <br />v <br />° <br />�'� B <br />i <br />40 O <br />I.0 <br />E <br />30 Now +48in.• Ott <br />- <br />c <br />Q. 70 f 13 /ise a <br />0.8 <br />33 <br />- --- - -- --- <br />2O <br />x° <br />o.s <br />o.e <br />xwe � KW <br />Ill IA to (I <br />0.8 <br />27 <br />10 Ill 1.0 4.0 <br />4.4 <br />0.7 <br />0.7 <br />24 <br />07 <br />e <br />0 <br />5 <br />V <br />2i <br />4 <br />0.6 <br />3 CAppc -rY <br />0.6 <br />2 = 4.5 CFS <br />15 <br />L o.5 <br />L <br />I.o <br />0.s <br />I 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 -64 <br />