Q$3$:A rectangular channel having a width of $3\mathrm{.}0m$

undergoes a transition. The width is changed to $2\mathrm{.}5m$ and

the bed has a smooth drop of $0\mathrm{.}2m.$ This transition

causes a drop of $0\mathrm{.}1m$ in the water surface between the

upstream and downstream of the transition. The depth of

flow in the upstream channel is $2\mathrm{.}0m.$ Assuming no loss

of energy in the transition, estimate the discharge in the

channel.