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<br />lU <br />t <br />~ <br />t <br />t <br />t <br />f <br />t <br />~ <br />t <br />t <br />~ <br />~ <br />~ <br /> <br />, <br />~ <br />I <br />~ <br />[ <br />t <br />i <br />~ <br />~ <br />r <br /> <br />~ <br />r <br />~ <br />t <br />~ <br />, <br />, <br />I.-.. <br /> <br /> <br /> <br /> <br />dn < de <br /> <br />-lP.a.~~PTH 2,,) <br /> <br />d. <br />STEEP SlOPE <br /> <br />d~dn <br /> <br />Voutl.' = .2.. Ap <br />Ap <br /> <br />. AREA OF FLOW PRISM BASEO ON <br />BARR EL GEOMElRY ANO DEPTH <br />EQUAL TO NORMAL OEPTH <br /> <br />Figure I1I-13-0iltlet velocity - inlet control. <br /> <br />~ <br /> <br /> <br />TW <br />0> TW >de , d = TW DEPTH <br /> <br />TW>D,d=D <br /> <br />de <br /> <br />TW ~ de . d' d e <br /> <br />Vou' <br /> <br />= Q ; Ap = AR EA OF FLOW PRISM BASED ON BARREL <br />Ij, GEOMETRY AND d <br /> <br />Figure I1I-14--0utlet velocity - outlet control. <br /> <br />profile convcrgcs toward normal depth as <br />calculations proceed down the culvert <br />barrel. Thcrefore, if the culvert is of <br />adequate lcngth, normal depth will exist <br />at thc culvert outlet. Even in short <br /> <br />culverts, normal depth can be assumed <br />and used to define the area of flow at <br />the outlet and obtain the outlet velo- <br />city. (figure 111-13) The velocity <br />calculated in this manner may be slightly <br /> <br />41 <br />