V$-$shaped swale is $0\mathrm{.}2$m deep at the centre and $4$m wide is $90$m long. It

has a gradient of $10$mm per metre and with an estimated roughness

coefficient of n$=0\mathrm{.}12.$ If it is full after a cloudburst, how long will it take to

empty using a simple analysis? $($k$=1$ for SI units$)$

note that silty$-$clay is $\mathrm{.}25$cm$/$hr $2\mathrm{.}5$mm$/$hr $7$ltr$/$sec$/$ha

If the swale is emptying into an attenuation pond $0\mathrm{.}1$ ha with a silty$-$clay

bottom, will the attenuation pond be able to keep up with the stormwater

coming from the swale?