Water flows down a spillway into a rectangular channel $(12\frac{m^3}{s}$ per width$)$ with a

velocity of $20\frac{m}{s}.$ The downstream depth of flow that causes a hydraulic jump is

most likely: $($m$)$

$3\mathrm{.}4$

$5\mathrm{.}5$

$8\mathrm{.}2$

$6\mathrm{.}7$