A $1\mathrm{.}2-$m flat$-$bottomed channel with $2$ to $1$ side slopes will be used as a ditch along the new highway. It will be paved with finished cement concrete and has a channel slope of $1\mathrm{.}5$ percent. The depth of flow is $790mm.$ Compute the velocity of flow $(\frac{m}{sec}.)$

Determine the depth and velocity of flow in a trapezoidal channel $(n=0\mathrm{.}030)$ with $2$ to $1$ side slopes and $1\mathrm{.}2-m$ bottom width discharging $1\mathrm{.}7\frac{m^3}{sec}.$ on a slope of $2$ percent