Task $3$: designing an open channel flow

$3\mathrm{.}1$ In another part of Ajloun city water will be carried in a trapezoidal channel lined with concrete is required to carry $8\mathrm{.}5\frac{m^3}{sec}.$ The channel will have a bottom slope of $0\mathrm{.}001\frac{m}{m}.$ and side slopes of $2.$ Design $($size$)$ the channel using the best hydraulic section approach.

$3\mathrm{.}1\mathrm{.}1)$ Solve a Manning equation for a given open channel flow situation.

$3\mathrm{.}1\mathrm{.}2)$ Show a section of your designed channel with specified dimensions $($use a proper drawing to scale$).$