Civil Engineering MCQJE Level Civil Engineering
For a rectangular channel of width B carrying discharge Q per unit width q, the critical depth yc is:
Fluid MechanicsFluid MechanicsMEDIUM
Choose the correct answer
A
yc = (q/g)^(1/2)
B
yc = (q²/g)^(1/3)
C
yc = q/(g)^(1/3)
D
yc = g/q²
Correct Answer
B. yc = (q²/g)^(1/3)
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At critical flow Fr = 1, specific energy is minimum. For rectangular channel: yc = (q²/g)^(1/3) where q = Q/B. Critical velocity Vc = √(g·yc). Critical depth separates subcritical (y > yc, Fr < 1) from supercritical (y < yc, Fr > 1) flow.
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