The Chezy''s formula for velocity in a channel V = C√(RS) is related to Manning''s formula by:
Choose the correct answer
C = n·R^(1/6)
C = R^(1/6)/n — Chezy''s C related to Manning''s n and hydraulic radius
C = 1/n always
C = n²/R
Correct Answer
B. C = R^(1/6)/n — Chezy''s C related to Manning''s n and hydraulic radius
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Manning: V = (1/n)R^(2/3)S^(1/2). Chezy: V = C√(RS) = C·R^(1/2)·S^(1/2). Equating: C = R^(1/6)/n. So Chezy''s C depends on R and n. Chezy''s C is not a constant; it varies with hydraulic radius. Manning''s n is more constant and widely used in practice.
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