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<br />~ <br />I&.. 3 <br />z <br />- <br />u 2 <br />:>i <br /> <br /> 16 <br /> 15 <br /> 14 <br /> 13 <br /> 12 <br />..= II <br />I&.. <br />~ 10 <br />,Jt <br /> 9 <br /> 8 <br /> 7 <br /> 6 <br /> 5 <br /> <br />5 <br /> <br /> ~ <br /> ~ ---- <br /> ~ ~ <br /> t-- <br /> ~ i--' <br /> ~ CRITICAL DEPTH - <br /> / I . . <br /> ./ RECTA~ GULAR S CTION <br />/' <br /> <br />4 <br /> <br />o <br />o <br /> <br />30 <br />JL <br />NB <br /> <br />40 <br /> <br />50 <br /> <br />60 <br /> <br />10 <br /> <br />20 <br /> <br /> .. <br /> L... <br /> ~ 17 <br />~ <br />I- NOTE: Yc CANNOT L--' <br /> EXCEED TOP OF BOX I"" <br />- L--' <br /> I.... <br /> 1,;1' <br /> I.... <br /> L--' <br /> ~ <br /> 1..1 <br /> ,/ <br /> , C,R,ITI~~L DEPTH- I- <br /> ~ RECT "NGULAR'SECTlON <br /> II I I I <br /> , <br /> , <br /> , 1'-8- <br /> ~ B IN FT. <br /> , Q IN C.F.S. <br /> , ..I I ~ 2 <br />~ yc= .315 (~B~ <br /> I I I I I I I <br /> <br />4 <br />'50 <br /> <br />150 <br /> <br />200 <br />Q <br />NB <br /> <br />250 300 350 <br />FIGURE 111-3 <br />CRITICAL DEPTH <br />RECTANGULAR SECTION <br /> <br />100 <br /> <br />BURUU Of' PUlllC ROADS JAN. 1M3 <br /> <br />III-8 <br />