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<br />invert required to convey a given discharge <br />through the inlet. This relationship <br />remains constant regardless of the elev- <br />ation of the inlet invert. If the entrance <br />end of the culvert is depressed below the <br />stream bed, more head can be exerted on <br />the inlet for the same headwater eleva- <br />tion. <br /> <br />Two methods of depressing the entrance <br />ends of culverts are shown in figures <br />II1-S and II1-6. Figure III-S depicts <br />the use of a depressed approach apron <br />with the fill retained by wingwalls. <br />Paving the apron is desirable. Figure <br />III-6 shows a sump constructed upstream <br />of the culvert face, Usually the sump <br /> <br />j <br />~ <br />j <br />t <br />1 <br />J <br />1 <br />. <br />1 <br />J <br />J <br />j <br />. <br />~ <br />:'1 <br />. <br />. <br /> <br />-~ <br /> <br /> <br />J <br />, <br />. <br /> <br />s~ <br /> <br /> <br />1 <br />. <br />J <br />I <br />. <br />j <br />. <br />, <br /> <br />So <br /> <br />~ <br /> <br />o <br /> <br />, <br />; <br />; <br /> <br />T <br /> <br />ELEVATION <br /> <br />1 <br />1 <br />1 <br />1 <br />~ <br />1 <br />. <br /> <br />0/2 <br /> <br /> <br />, <br />J <br />~ <br /> <br />2T 0/2 <br />(M1N,) <br /> <br />B <br /> <br /> <br />. <br />J <br />. <br />J <br />~ <br /> <br />. <br /> <br /> <br />PLAN <br /> <br />Figure III-S--Culvert with depressed apron and wingwalls. <br /> <br />30 <br />