Problem # $2(10$ Marks$)$

A storm drain system consisting of two inlets and pipe is to be designed using rational method. A schematic of the system is shown and the attached IDF is for the catchment area

Determine the $50$ year peak flow to be used for sizing the sewer pipes $2_{?}$ and $3$

The travel time in pipe $1$ is $10$ minutes and in pipe $2$ is $15$ minutes

$(5$ marks each$)$