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<br />YO <br /> <br />YC <br /> <br />02,03,04 <br />O-r---- <br />'-$' <br />;to " G~,GI>. <br />';;;'0" G'2.' <br />/ ft' <br />+0"": \~ vI <br />~\O'" <br /> <br /> <br />c <br />o <br />;: <br />" <br />> <br />.. YB <br />LlJ <br /> <br /> <br />YA <br /> <br />A <br /> <br />Fig. 0.04. Tile area-elevatiull rdatiulIsllill <br /> <br />cross section and then calculating the area for each subsection as <br />illustrated above. Wetted perimeter is usually not calculated. <br />Rather the hydraulic radius is assumed equal to the depth and a com- <br />bined value of aj . DEPTHj2/3 is calculated for each trapezoid and the <br /> <br />result summed over each subsection to obtain a value to be used in <br />the place of A . R2/3 in the Manning equation. <br /> <br />The concept of "conveyance" is associated with the geometric and <br /> <br />hydraulic roughness terms in the Manning Equation. <br /> <br />Q = cnm . AR2/3 . Sf 1/2 <br /> <br />(5-12) <br /> <br />In terms of notation in this volume: <br /> <br />Q = K S 1/2 <br />t f <br /> <br />(5-13) <br /> <br />5.10 <br />