A $3\mathrm{.}0$ m wide horizontal rectangular channel is narrowed to a width of $1\mathrm{.}5$ m to cause critical flow in the contracted section. If the depth in the contracted section is $0\mathrm{.}8$ m $,$ calculate the discharge in the channel and the possible depths of flow and corresponding Froude numbers in the $3\mathrm{.}0$ m wide section. Neglect energy losses in the transition.