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<br />Lesson 3 <br /> <br />Culvert Design - Participant Workbook <br /> <br />3.10 IMPROVED INLET DESIGN <br /> <br />IMPROVED INLET DESIGN <br /> <br />. IMPROVED INLETS MORE IMPORTANT FOR <br />INLET CONTROL CULVERTS <br /> <br />. IMPROVED INLETS INCLUDE: <br />- bevel-edged inlets <br />- side-tapered inlets <br />- slope-tapered inlets <br /> <br />3.33 Improved Inlet Design <br /> <br />A. Improved inlet design can increase culvert capacity significantly for <br />culverts operating under inlet control, but will have only a minor effect on <br />culverts operating under outlet control. <br /> <br />1. Inlet improvements on culverts functioning under outlet control will <br />reduce entrance losses, but these losses are only a minor part of <br />the total headwater requirement. Therefore, only minor <br />modifications of the inlet geometry which result in little additional <br />cost are justified. <br /> <br />2. Inlet improvements on culverts functioning under inlet control can <br />change the typically part full flow in the barrel to full or nearly full <br />flow, better using barrel size and increasing culvert capacity <br />significantly. <br /> <br />B. Inlet improvements consist of bevel-edged inlets, side-tapered inlets and <br />slope-tapered inlets. <br /> <br />3-16 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />