Question $3$: i$)$ Using Talbot's Formula, calculate the required diameter of a single culvert pipe used to drain a catchment of $4\mathrm{.}8$ha with a rainfall coefficient of $0\mathrm{.}7?$ ii$)$ What is the minimum Design RL required at the edge of formation, if this culvert is to be located over a creek$-$bed at a RL of $234\mathrm{.}772$m and we have selected a Class Y type pipe?