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<br /> <br />t. . <br />~-" <br />"* <br /> <br /> <br />(, 1110-2-1601 <br />Ap'pendix IV <br />1 July 70 <br /> <br />b. The resistance equation for hydraulically rough channels (para 8c) is <br /> <br />. <br /> <br />12.2.R <br />C = 32.6 log 10 k <br /> <br />where <br /> <br />C = Chezy's coefficient <br />R = hydraulic radius, ft <br />k = equivalent roughness dimension, ft <br />This equation is plotted in plate IV - 2.. <br />c. A.s (CR1/2.)n is proportional to Vn, then'(CR1/2.)nA.n is propor- <br />tional to Q . From this the following equations are derivedt <br />n <br /> <br />Q (CR 1/2) A. <br />Q - T n n (IV -2.) <br />n - I[( CR 1/2) iA.i] <br /> <br />( <br /> <br />Q (CR 1/2. ) <br />V - T n <br />n - LUCR1/2);A.i] <br /> <br />(CR 1/2) = I[( CR 1/2.) iA.iJ <br /> <br />mean rA.i <br /> <br />Qn <br />A. <br />n <br /> <br />(IV-3) <br /> <br />or <br /> <br />(IV-4) <br /> <br />s= <br /> <br />-2. <br />V <br />[( CR 1/2. )meanY <br /> <br />. <br /> <br />(IV-5) <br /> <br />. <br /> <br /> <br />(IV-6l <br /> <br />t The subscript i assumes all values of n. <br /> <br />1c <br /> <br />IV-2 <br /> <br /> <br />3. Back <br /> <br />eter 5 ne( <br /> <br />IV-3. Ce <br />and plott <br />The metl <br />tions for <br /> <br />b. <br /> <br />assumed <br /> <br /> <br />of the re; <br /> <br />signed to <br /> <br /> <br />the reaCT <br /> <br />selected, <br /> <br /> <br />signed in <br /> <br /> <br />beginning <br /> <br /> <br />lmproved <br /> <br />4. Roug <br /> <br /> <br />equivalero <br /> <br />draulic Ie <br /> <br /> <br />regime w <br /> <br />still be u <br /> <br /> <br />grade lin. <br /> <br /> <br />spherical <br /> <br />Manning' , <br /> <br />knowledg, <br /> <br />with chan <br /> <br />bette r to <br /> <br /> <br />rather the <br /> <br />should be <br /> <br /> <br />ditions pr <br /> <br /> <br />regulariti <br /> <br />cause bre <br />