A rectangular sedimentation will have a flow of $4\mathrm{.}0$ MGD using a $7$:$1$ length to width ratio,

and an overflow rate of $40$ m $3$ m $-2$ d$-1.($a$)$ What will the required dimensions of the basin if we use a

length to depth ratio of $15$ as specified in Table $10-4$ in your textbook $($provided in class notes$)($b$)$ What

will be the estimated detention time in hours, and does this value fall within the recommended range of

$1\mathrm{.}5-4$ hours? $($c$)$ What minimum length of weir do you need to add to meet the design criteria in the table?