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