What is the hydraulic radius of a stable canal

What is the hydraulic radius of a stable canal carrying a discharge of 27 m3/s using Lacey’s method? (Assume silt factor is 1.0)

[A] 1.44 m
[B] 2.67 m
[C] 3.14 m
[D] 4.28 m

ANSWER= [A] 1.44 m

Detailed Solution for Civil Engineering Exam

Hydraulic radius (R) = 0.47(Q/f)^1/3

R = 0.47(27/1)^1/3

R = 1.41 m

Here closest answer is option A 1.44 m