$($i$)$ A channel with a trapezoidal $x-$sectional shape is used to discharge effluent into a stream. The channel is $4m$ wide at the base with side slopes of $2$ horizontal to $1\mathrm{.}5$ vertical. The depth of waste water effluent is $1,5m$

$($a$)$ Provide a graphical representation of the channel.

$($b$)$ Calculate the volume per unit time of wastewater

$[2$ marks$]$ through the channel when the depth of flow is effluent passing horizontal bed slope of the channel is $1$ in $350$ is $1\mathrm{.}5m$ and the Coefficient $n$ as $0\mathrm{.}025.$

$($c$)$

Question $3$

What is meant by a sewer appurtenance? example of a sewer appurtenance and its role.

$[2+4$ marks$]$

Mention one $(1)$

marks$]$