Question $1(20$ point$)$

A sewage line is to be designed to serve an area which in the year $2024$ has a population of $60,000$ inhabitants. The following data is available:

Population growth rate $=4\%$

Average water consumption $=41\mathrm{.}61\frac{m^3}{?}$ capita.year

Pipe slope $=3\%,$ Manning coefficient $=0\mathrm{.}013$

Sewage production $=85\%$ of water consumption

A$)$ Find the diameter and the partial flow velocity of this trunk line to carry the peak flow of the year $2035$

B$)$ What are the flow depth and the partial flow velocity at the year $2050($comment on your result$).$