ANSWER THIS WITH FULL WORKING OUT Q$1\mathrm{.}2.$ Based on Rational Method determine the flood discharge in m $3/$s $($Q max $)$ for the Average Recurrence Interval $($ARI$)$ of $100$ years. Assume the area of the catchment is $630$ km $2,$ the average slope $2\%$ and the mainstream length in the catchment is $5\mathrm{.}37$ km$.$ The impervious fraction of catchment area is $0\mathrm{.}36($f $=0\mathrm{.}36).$

Note: For the design purpose, select the flood discharge in the river in the location of the bridge based on the maximum of these two flood discharges, calculated based on FFA and the rational method