A $100$ m wide rectangular channel with a sluice gate, the water depth behind the gate $(y_0)$ is $2\mathrm{.}5$ m $,$ and the

water depth at the sluice gate outlet $(y_1)$ is $0\mathrm{.}6$ m $.$ If there is a hydraulic jump at the downstream of the gate

and the flow condition remains subcritical $($depth is $y_2).$ Assume there is no energy loss. Please determine:

$(1)$ pts