$4-4$ A rectangular troweled concrete channel $12ft$ wide with for a discharge of $600cfs.$ For a water temperature of $40F,$ estimate the depth of flow.

$4-5$ Water flows at a depth of $6ft$ in the trapezoidal, concrete$-$lined channel shown. If the channel slope is $1ft$ in $2000ft,$ what is the average velocity, and what is the discharge? $V?Q?$

$Q=686\mathrm{.}615f\frac{t}{s}$

$V=\frac{Q}{A}=5\mathrm{.}202f\frac{t}{s}$