Wetted perimeter of a regime channel for a discharge of 64 cumecs as per Lacey’s theory will be
A. 19m
B. 38m
C. 57m
D. 76m
Answer: Option B
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P=4.75√Q
P=4.75√64
P=38m
Wetted perimeter = 4.75 × √Q
=4.75 × 8. = 38m
Wetted Perimeter= 4.825√Q
4.825√64= 38.6