Question $3$

$($a$)$ The runoff data measured following a $2-$hour storm are given in Table Q$3.$ If the baseflow is

$2\mathrm{.}0\frac{m^3}{s},$ determine the $10mm2-$hour unit hydrograph. Note that the catchment area

draining the river is $319{10}^6{m}^2.$

$($b$)$ For a $2-$hour storm of total rainfall $19m\frac{m}{?}$ hour and losses of $3m\frac{m}{?}$ hour, derive the quick

response runoff using the unit hydrograph obtained in $($j$).$