Civil Engineering MCQJE Level Civil Engineering
The hydraulic radius (R) of a full circular pipe of diameter D is:
Fluid MechanicsFluid MechanicsEASY
Choose the correct answer
A
D/2
B
D/4
C
D
D
πD/4
Correct Answer
B. D/4
Why is this the answer?
R = A/P = (πD²/4)/(πD) = D/4. A = flow area, P = wetted perimeter. For a rectangle b×d flowing full: R = bd/(2b+2d). R is used in Manning''s and Chezy''s formulas. For pipes, hydraulic diameter Dh = 4R = D (full flow). For non-circular shapes, D_equivalent = 4R.
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