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tl 5• <br /> I <br /> Nw = z. ZS <br /> HYDRAULICS OF CULVERTS 161 <br /> 180 10,000 <br /> 168 —0,000 LOSS COEFFICIENT Ke I I <br /> 6,000 FOR VARIOUS ENTRANCE (2) <br /> 1s6 5 00p TYPES o' (3) <br /> 144 4,000 HW ENTRANCE <br /> p SCALE TYPE COEFFICIENT y' e' <br /> 132 3,000 y 6. <br /> (1) Headwall,sq edge;or End 0.5 <br /> 120 d 2,000 Section conforming 10 fill 5. <br /> _o slope 4. <br /> too (2) Mitered to conform to slope 0.7 <br /> (5I Projecting from fill 0.9 3. 4. <br /> - 96 1,000 3. <br /> N 600 — — 3. <br /> To use stole(2)or(7)project <br /> 84 600 horizontally to scale(1),then <br /> use stre,ght inclined line through 2. , <br /> -500 D and O scales,or reverse as <br /> 400 illustrated <br /> 72 2. 2. <br /> - 300 p' <br /> u <br /> 3 1.5 <br /> in 200 = <br /> c --60 V 1.5 1.5 <br /> c s _u <br /> 54 - <br /> - 100 E <br /> 0 <br /> 9 _ 8o <br /> _ C <br /> V s -60 —EX�M�lE <br /> r I.0 <br /> 1.0 <br /> 0 42 � So — <br /> u <br /> `0 40 EXAMPLE _-g__ g 1.0 <br /> u v <br /> E 36 Diam.(D)=18 in =4 h. 0 <br /> 2 cis — — — -----Q=7— ——- 3 .9 <br /> 33 <br /> 20 <br /> Scala HW HW <br /> 30 p•- <br /> (1) 10---- 40ft. - ------ 9 <br /> '^ 27 t0 (2) 1.0 40 <br /> u 8 (3) 1.1 44 •7 .7 <br /> rn 24 6 .7 <br /> o -y <br /> V 21 4 <br /> � .6 .6 <br /> 3 6 <br /> ° to <br /> N 2 <br /> 15 <br /> 11.0 .5 <br /> HEADWATER DEPTH FOR <br /> 12 CORRUGATED STEEL PIPE CULVERTS <br /> WITH INLET CONTROL <br /> Fig. 4.18. Inlet control nomograph for corrugated steel pipe culverts. The manufac- <br /> turers recommend keeping HW/O to a maximum of 1.5 and preferably to no more <br /> than 1.0. <br />