QUESTION $6$

HEC$-$RAS Set #$66-5-6$

A rectangular channel with a bottom width of $5m,$ a bottom slope of $0\mathrm{.}0013,$ and

Manning's $n$ of $0\mathrm{.}023$ has a discharge of $66cms.$ A sluice gate installed at the

downstream end maintains a water depth of $6m$ just upstream of the gate. Compute

the critical depth $)$ of the channel. Enter the answer up to two decimal places $($like

$3\mathrm{.}21)$ without unit.