Question: ( Manning equation ) Water flows in a rectangular channel of width ( b ) at a depth of ( b /

(Manning equation) Water flows in a rectangular channel of width \( b \) at a depth of \( b /4\). Determine the diameter of a circular channel (in terms of \( b \)) that carries the same flowrate when it is half-full. Both channels have the same Manning coefficient, \( n \), and slope.
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( Manning equation ) Water flows in a rectangular

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