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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 datai9,20 on <br />these. While these <br />designs increase the flow, their use has not been as <br />expected. The increased costs of the special treatments is apparently respon- <br />sible. <br />, <br />ay" ie s <br />A$OVE C.dulE <br />,.0 <br />10.000 <br />(I ) <br />,p <br />-.111,000 LOSS COEFFICIENT Ita <br />6,000 FOR VARIOUS ENTRANCE (211 <br />-Ise <br />5'00P TYPES <br />6. <br />144 <br />4,000' <br />G SCALE <br />ENTRANCE <br />COEFFICIENT <br />S• <br />(3) <br />6. <br />132 <br />3,000 <br />TYPE <br />6. <br />120 <br />t n <br />1w.d aR, p. edge. er End <br />f eetiaa caafarmin� to IN <br />0.3 <br />. <br />0. <br />o <br />2,000 <br />do" <br />4 <br />106 ° <br />12) <br />AAilaed to conform to s6" <br />0.7 <br />13) <br />►roiectina from fill <br />0.f <br />3. <br />4. <br />2 <br />-r- <br />!s <br />1,000 <br />3. <br />TN <br />•00 To use scale (7) or (3) "so <br />3. <br />04 <br />600 horieeffth to inclosed nae scale (11. Men <br />use t ""N <br />2• <br />SOO 0 and o seoles, or ..verso as <br />72 <br />400 ilaYraled. <br />2 <br />2. <br />300 <br />- <br />3 <br />I.S <br />so <br />„ <br />200 = <br />1.5 <br />1.3 <br />0 <br />.. <br />34 ' <br />O <br />y <br />a <br />0 <br />100 2 <br />t <br />_ieYP <br />60 <br />O <br />V <br />42 " <br />SO s n <br />I_O <br />I.O <br />- <br />r <br />4o Ex/1MM 0 <br />1.0 <br />0 <br />36 <br />30 tam. to) a48in.n4fI o <br />_ <br />- <br />0. 70 0/sac 3 <br />0.8 <br />0 <br />seek MW MW <br />0.8 <br />0.8 <br />0.8 <br />(1) 1.0 4.0h <br />�r <br />27 <br />IQ 17) 1.0 4.0 <br />(3) 1.1 4.4 <br />0.7 <br />0.7 <br />& <br />24 <br />a <br />O 7 <br />fi <br />0` <br />0 <br />1 <br />S <br />4 CAPFC <br />0.6 <br />0.6 <br />0 <br />I` <br />3 <br />� {g85 CPS <br />0.6 <br />a <br />�^ <br />Y <br />IS O.S <br />1.o O.S <br />HEADWATER DEPTH FOR <br />i2 CORRUGATED STEEL PIPE CULVERTS <br />WITH INLET CONTROL <br />Figure 3.28 Inlet control nomograph for corrugated steel pipe culverts. 13 The <br />manufacturers rommmend keeping NIN/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 -65 <br />