Hydraulic and hydrologyProblem $2.$ Given below are the ordinates of a $6-$hr unit hydrograph for a catchment. Two storms each

of $6-$hr duration and having rainfall excess values of $3\mathrm{.}0$ and $2\mathrm{.}0cm$ respectively occur successively. The

$2-cm$ excess rain follows the $3-cm$ rain. Calculate the resulting direct runoff.