Q $(3).$ Water from a very large reservoir flows

without viscous effects through $AB,BC$ and

$CD$ pipes. Calculate the discharge of the

system and velocity at each cross$-$section. Plot

the energy line and hydraulic grade line.

$({}_{\text{w}\text{a}\text{t}\text{e}\text{r}}=9\mathrm{.}81k\frac{N}{m^3})$