$($c$)$ The characteristic curve given in Fig Q$4$ belongs to a pump to be used for the supply

of water to a reservoir via a $250mm\frac{O}{?}$ rising main, $1km$ in length with a static lift of

$10m.$ Assuming a roughness of $0\mathrm{.}03mm$ in the pipe determine the pumps operating

efficiency and power requirements.

Fig Q$4$