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<br />5, Manning's Equation <br /> <br />1 <br />V = <br /> <br />n <br /> <br />R2/3 S 1{2 <br />o <br /> <br />where <br /> <br />v = Mean velocity, rn/s <br />n = Manning's roughness coefficient <br /> <br />R = Hydraulic radius = ~ ' m <br />A = Cross section of flow area, m2 <br />P = Wetted perimeter of flow area, m <br />So = Slope of energy grade line, m/m <br /> <br />Note: The Manning's equation assumes steady, unifonn <br />flow, Under these conditions, the slope of the energy <br />grade line, water surface slope, and bed slope are the <br />same. <br /> <br />6, Conveyance <br /> <br />From continuity, the discharge form of the Manning's equation is: <br /> <br />Q=~ AR2/3 S 1{2 <br />n <br /> <br />The expression (~ AR 2J3) is often referred to as the conveyance <br /> <br />of the channel section (k) which can be expressed as: <br /> <br />3.6 <br />