The Manning's formula is given by the expression:
AV= (1/N)R^(2/3) S^(1/2)
BV= C(RS)^0.5
CV= 83.47 R^(2/3) S^(1/2)
DV= 0.85 C R^0.63 S^0.54
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AV= (1/N)R^(2/3) S^(1/2)
BV= C(RS)^0.5
CV= 83.47 R^(2/3) S^(1/2)
DV= 0.85 C R^0.63 S^0.54