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<br />I <br />i, <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br /> <br />Lesson 3 <br /> <br />Culvert Design - Participant Workbook <br /> <br />BEVEL-EDGED INLETS <br /> <br />. BEVELED EDGES REDUCE CONTRACTION OF <br />FLOW BY ENLARGING THE CULVERT FACE <br /> <br />. BEVELS ARE PLANE SURFACES, BUT <br />ROUNDED CULVERT EDGES ARE ALSO <br />EFFECTIVE <br /> <br />3.34 Bevel-Edge Inlets <br /> <br />C. <br /> <br /> <br />3.35 Beveled Edge Example <br /> <br />Beveled edges reduce the contraction of flow by effectively enlarging the <br />face of the culvert. Bevels are plane surfaces, but rounded edges that <br />approximate a bevel, such as the socket end of RCP, are also effective. <br />Bevels are recommended on all headwalls. <br /> <br />SIDE-TAPERED INLETS <br /> <br />. TAPERED INLETS IMPROVE PERFORMANCE <br />BY PRDVIDING A MORE EFFICIENT CONTROL <br />SECTION <br />. INTERSECTION OF SIDEWALL TAPERS AND <br />BARRELI$ DEFINED AS THE INLET <br />. TWO CONTROL SECTIONS POSSIBLE: <br />- at the face <br />- at the throat <br /> <br />3.36 Side-Tapered Inlets <br /> <br /> <br />3.37 Side-Tapered Example <br /> <br />D. A second degree of improvement is a side-tapered inlet. Tapered inlets <br />improve culvert performance by providing a more efficient control section <br />(the throat). The inlet has an enlarged face area with the transition to the <br />culvert barrel accomplished by tapering the sidewalls. <br /> <br />1. The intersection of the sidewall taper and barrel is defined as the <br />throat section. <br /> <br />2. Two control sections occur on a side-tapered inlet: at the face and <br />throat. <br /> <br />3. Throat control reduces the contraction at the throat. <br /> <br />3-17 <br />