The 'Chezy-Manning'' coefficient n in Manning''s formula represents:
Choose the correct answer
Channel cross-sectional area
Manning''s roughness coefficient — represents hydraulic resistance of channel or pipe material; lower n = smoother
Diameter of pipe in mm
Flow depth
Correct Answer
B. Manning''s roughness coefficient — represents hydraulic resistance of channel or pipe material; lower n = smoother
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Manning''s n = roughness coefficient of channel/pipe surface. Lower n = smoother surface = higher velocity for given slope. Values: very smooth concrete 0.011; smooth concrete 0.012–0.014; rough concrete/brick 0.015–0.020; earthen channel 0.020–0.030; natural winding river 0.035–0.050. n is purely empirical — determined from field measurements. Same n used in Chezy''s C = R^1/6/n.
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