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<br />Tables A and B compare the inlet control performance of the <br />different inlet types. Table A shows the increase in discharge <br />that is possible for a headwater depth of 8 feet. The bevel- <br />edged inlet, side-tapered inlet and slope-tapered inlet show <br />increases in discharge over the square-edged inlet of 16.7 ,30.4 <br />and 55.6 percent. respectively. It should be noted that the <br />slope-tapered inlet incorporates only the minimum FALL of D/4. <br />Greater increases in capacity are often possible if a larger FALL <br />is used. <br /> <br />TABLE A <br /> <br />COMPARISON OF INLET PERFORMANCE AT <br />CONSTANT HEADWATER FOR 6 FT. x 6 FT. RCB <br /> <br />Inlet Type Headwater Discharge % Improvement <br />Square-edge 8.0' 336 cfs 0 <br />Bevel-edge 8.0' 392 cfs 16.7 <br />Side-tapered 8.0' 438 cfs 30.4 <br />*Slope-tapered 8.0' 523 cfs 55.6 <br /> * Minimum FALL in inlet = D/4 = 1.5 ft. <br /> <br />Table B depicts the reduction in headwater. that is possible <br />for a discharge of 500 cfs. The headwater varies from 12.5 ft. <br />for the square-edged inlet to 7.6 ft. for the slope-tapered inlet. <br />This is a 39.2 percent reduction in required headwater. <br /> <br />TABLE B <br /> <br />COMPARISON OF INLET PERFORMANCE AT <br />CONSTANT DISCHARGE FOR 6 FT. x 6 FT. RCB <br /> <br />Inlet Type Discharge Headwater % Reduction <br />Square-edge 500 cfs 12.5' 0 <br />Bevel-edge 500 cfs 10.1' 19.2 <br />Side-tapered 500 cfs 8.8' 29.6 <br />*Slope-tapered 500 cfs 7.6' 39.2 <br /> *Minimum FALL in inlet = D/4 = 1.5 ft. <br /> <br />13-16 <br /> <br />. <br /> <br />. <br /> <br />-. <br />" <br /> <br />e <br /> <br />~ <br /> <br />- <br />" <br /> <br />e <br />