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<br />W.I:.,i <br /> <br />, I, <br /> <br /> WIDTH <br /> YC WATER SURFACE -; r- <br /> c: <br /> 0 03 I I <br /> ;: <br /> " 1081 <br /> ~ I I <br /> IIJ YB 1 <br /> PJ I I <br /> I '" <br />c.n I I <br />. I <br /><:> I I <br />ao I <br /> YA 1 <br /> Distance <br /> <br /> <br />J <br />A.~laj ( 5-9) <br />J- <br />J <br />psI PI (5-10) <br />J=I <br />R=A/P (5-11) <br /> <br /> <br /> <br /> <br /> <br />... L,gend <br />A = Accumulated area of all trapezoids <br />OJ = Area of Ith trapezoid = WIDTH, DEPTH <br />DELY = YI1"1 -YI <br />DEPTH = Average depth <br />J = Total number of trapezoids <br />P = Accumulated wetted perimeter of all trapezoids <br />PI = Wetted perimeter of Ith trapezoid = vWIDTH2.. DELy2 <br />WIDTH = Xj+l- Xj <br /> <br />Fig. 5.03. Area "end wetted perimeter of a river channel subsection <br />