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Improved Inlets <br />• Culvert capacity maybe increased through the use of special inlet designs. <br />19 <br /> The Federal Highwa y Administration has developed extensive data <br />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 appazently respon- <br /> sibte. c{S LE CiUi.VE'R.T ~1U}X• Wf-Tt'il' <br /> i•©~ /f$oLl~ <br /> .°o lo.~ t~H/6J?T' <br />tl) <br /> t68 -fi,ooo LOSS COEFFICIENT Ke <br /> DDO FOR VARIOUS ENTRANCE (2t <br />° <br /> 13° . <br />TYPES 6. <br />°•oop t3) <br /> 114 4.000 0 ,KALE ~ ~~ COEffICtENT S- 6. <br /> ~~ 132 3,000 6. <br /> <br />120 fll tloodr<d6 a. odq•: er End 0.3 <br />t°ntwmingb(il 3 <br /> V . <br />2,000 do <br />4. <br /> 10° ~ <br />o 127 Mtlond bsontenn la dop• OJ <br />3 <br />4 <br /> . <br />. <br />tJ7 hei•erilq frow Wt 0.9 <br /> 5 <br />. y° ~ <br />I,ooo 3. <br /> ~ °~ tow lmlo121 o•t71 WOItt~ 3. <br />I <br />I <br />1 <br />n <br />II <br /> H4 <br />r YpY bKO <br />1 <br />L1 <br />N11 <br />W <br />$~ <br />wLPo1g111i~iMd dM l6NUg11 Z. <br /> 3DD <br />D OM Q KOMt C! eMlff Of <br /> 4D° YIHhOtW. 2 <br />2 <br /> 72 . <br />. <br /> ~ 300 <br />3 I.s <br /> a <br /> e w zoo x Ls rs <br />" <br /> c _ s <br /> s+ 3 E <br /> i m <br />~ 100 <br />O <br />• ` <br />U <br />t <br />~ ~%•M~~ <br />C <br /> O u <br />i2 '• .~.~ ~~ <br />L 1.0 1.0 <br />DO `' o -~ <br /> m ~ 40 ExAA19LE ~ I,0 <br /> 0 36 30 Diom.lD1•a8in.•4tt o - <br /> 0 0. 70 ft3/see ~ O,g <br /> 33 20 ____ __ ____ <br />= O-6 0.9 <br /> 30 Swb -x~w_ Inv <br /> 6 (11 tp tON D'g <br /> '^ 27 <br />m 10 111 i,0 •D <br />1 At D.7 0.7 <br />I9 1 <br /> 24 ° <br />. <br />° 0 7 <br /> s ' <br /> 21 <br />g 4 6 <br />3 (,APPrC6sy o.e <br /> 0.6 <br /> '° ~ $~•O CF5 <br />2 <br /> <br /> Is - ~ oa <br /> 1.o O-s <br />HEADWATER DEPTH FOR <br />I2 CORRUGATED STEEL PIPE CULVERTS <br />WRH INLET CONTROL <br />Figure 3.28 Inlet control nomograph for corrugated steel pipe culverts.13 The <br />manufacturers recommend keeping NW/D to a maximum of 1.5 and preferably ro no <br />more than 1.0 for diameters greater than 4 ro 5 feet. <br />• REVISED MARCH2O06 Attachment 2.05.3(3)-1-63 <br />