In a rectangular channel, the ratio of the velocity head to the flow depth for critical flow condition, is

(A) $\frac{1}{2}$

(B) $\frac{2}{3}$

(C) $\frac{3}{2}$

(D) 2

In a rectangular channel, the ratio of the velocity head to the flow depth for critical flow condition, is

(A) $\frac{1}{2}$

(B) $\frac{2}{3}$

(C) $\frac{3}{2}$

(D) 2

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