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I52 STEEL DRAINAGE AND HIGHWAY CONSTRUCTION PRODUCTS <br />Improved Inlets <br />Culvert capacity may be increased through the use of special inlet designs. <br />The Federal Highway Administration has developed extensive data" 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 />• <br />• <br />'^ 27 <br />4 <br />0 <br />lea <br />168 <br />136 <br />144 <br />..132 <br />120 n <br />0 <br />S <br />loo c <br />- 96 2 <br />i <br />H <br />84 <br />72 <br />60 <br />Q 94 <br />0 <br />U 6-_ <br />42 <br />m <br />m <br />E <br />C 36 <br />33 <br />30 <br />10,000 <br />8,000 LOSS COEFFICIENT Ice (I ) <br />e,ooo FOR VARIOUS ENTRANCE (2) <br />a.0op TYPES 6 (3) <br />4,000 KW3CALE ENTRANCE COEFFICIENT s 6. <br />3,000 TYPE 6. <br />(1) Meodwo 1 sq. edge: End 0.5 . <br />2.000 Section conFormNnq toorFn11 S. <br />slops 4. <br />121 Mitered to conform to dole 0.7 <br />(3) Projecting from fill 0.9 3. 4. <br />1,000 <br />800 To us* scale (2) or 13) project <br />600 horizontally to scot* (1), then <br />was straight inclined line through <br />500 0 and a scoot, ON rewne as <br />400 illustrated. <br />300 <br />V <br />0 <br /> <br />N. 200 <br /> <br />O <br /> 100 <br />4 <br />°n 80 <br /> -_ - <br /> <br />_ <br />60 <br />L so <br /> <br /> 40 <br />30 3. ein.-4ff <br />0a 70ft3/see_ <br />Scale MW MW <br />(1) 1.0 4.0 It <br />(2) 1.0 4.0 <br />(3) 1.1 4.4 <br />6 <br />3 <br />0.7 <br />'2 21 4 11 WS 0.6 0.6 <br />? 3 ? eZH tr ?.?? 0.6 <br />o le <br />2 ?'pR ?kLfJ?a = ?.® <br />16 1y exs pm AN'r 05 0.5 <br />1.0 ?} ¢ <br />&A ER DEPTH FOR <br />C"'LP W <br />2L L 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/0 to a maximum of 1.5 and preferably to no <br />more than 1.0 for diameters greater than 4 to 5 feet. <br />Whirlwind Portal Area As Built Report 5 <br />3. <br />2. <br />M2.1 <br />. <br />I <br />,'S <br />1.5 <br />-•? a <br />p ITO 1.0 <br />1.0 <br /> <br />3 <br />O 0.9 <br />D <br />, 0.8 0.8 <br /> <br /> 0.8 <br /> IF- 0.7 0.7