d$)$ A pipe draining an area $($A$)$ of $7500m^2$ Carpark in new shopping centre

has been calculated as having a time of concentration $($tc$)$ of $10$mins.

Using a design storm $(P)$ of $8mm$ calculate the peak runoff $(Q_P)$ in $\frac{1}{s}$ in

the pipe assuming that the runoff coefficient $($C$)$ is $09$

Rational Method: $Q_p=$ CiA

Intensity of Rainfall: $i=\frac{P}{tc}$