Civil Engineering > GATE 2025 SET-1 > Canal Design
Lacey's regime equations, followed in India for making scour calculations while designing hydraulic structures across alluvial channels, are given below. Regarding these equations, which of the following statements is/are true:
D=0.470×[Q/fs]1/3
P=4.75×√Q
fc=1.76×√d
where, Q is discharge and fs is silt factor.
A
D is the depth of scour below the existing riverbed
B
P is the Lacey's waterway width
C
d is the average grain size diameter of the bed material in centimetres
D
D is the depth of scour below the design flood level

Correct : b

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