Laserfiche WebLink
Improved Inlets <br />Culvert capacity may be increased through the use of special inlet designs. <br />The Federal Highway Administration has developed extensive datal¢ 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. mttx iomrz= a <br />60 - <br />Io,000 460VE U' W_Va� <br />168 , 6,000 LOSS COEFFICIENT Ke U ) <br />6 oao FOR VARIOUS ENTRANCE (g) <br />156 TYPES 6. <br />5,00p (3) <br />144 4,000 Hw ENTRANCE <br />p SCALE TYPE COEFFICIENT <br />-' 132 3,000 6. <br />(1) XeedoeEl. sq. edger er End 0.5 <br />120 m Senlooeonfmrmm mfdl 5. <br />G 2,000 d.Fm 4 <br />406 121 Mitered w conlarm to dope 0.7 <br />O (3) Projeving from fill 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 culvens. The <br />manufacturers recommend keeping HWJO 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 August 2009(PB06) Attachment 2.05.3(3) -1 -68 <br />Bb <br />l,V'00 <br />3. <br />I <br />;n <br />Boo <br />T. pu uele f2) er (3) praja f <br />3. <br />84 <br />600 imra .11, m ue[e 111, than <br />2. <br />•se vroigM im <lmed Im. thrppgh <br />I <br />500 D and 0 wales, or r<verx at <br />ao0 Blmueeed. <br />2 ' <br />72 <br />2. <br />300 <br />- <br />>n <br />3 <br />1.5 <br />c <br />60 m <br />200 2 <br />L5 <br />1.5 <br />O <br />54 O <br />a <br />d <br />> <br />m <br />100 0 <br />U <br />o <br />v <br />42 <br />60�' <br />- <br />a <br />4 EXAMPLE <br />I _ 0 <br />E <br />30 Oiom.(0)= 48in. =4ft <br />O <br />".Q <br />6 <br />0 = TO tt /sec 3 <br />p,8 <br />33 <br />________ - -_ I <br />M <br />20 <br />0 <br />0.8 <br />0.e <br />&.1. MW 10, T <br />30 <br />D. <br />u <br />(1) Lo 40 ft <br />0.8 <br />"O <br />27 <br />to 12) 1.0 IA <br />y <br />6 (3) 1.1 4.4 <br />0.7 <br />0.7 <br />pe <br />24 <br />0 <br />0 <br />21 <br />5 �r••I�•2 <br />O.6 <br />Q.fi <br />. <br />4 <br />3 s 47.0 CF$ <br />O.6 <br />c <br />a <br />le <br />.n <br />2 <br />IS <br />0.5 <br />.0 <br />0.5 <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 culvens. The <br />manufacturers recommend keeping HWJO 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 August 2009(PB06) Attachment 2.05.3(3) -1 -68 <br />