In open channel flow, the critical depth (yc) for a rectangular channel with discharge per unit width ‘q’ is given by:
A(q^2 / g)^(1/2)
B(q^2 / g)^(1/3)
C(q / g)^(1/3)
D(q^3 / g)^(1/2)
Explanation
At critical flow in a rectangular channel, specific energy is minimum and Froude number Fr = 1. The critical depth yc = (q^2 / g)^(1/3), where q is discharge per unit width (q = Q / b).
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