Show that bernoullis equation applied between sections 1

Question

The solution to Problem is

Show that Bernoulli's equation applied between sections 1 and 2 does not give this result. Derive all expressions for the change in total head across a hydraulic jump.

Problem:-

As can often be seen in a kitchen sink when the faucet is running, a high-speed channel flow (v₁, h₁) may ''jump'' to a low-speed, low-energy condition (v₂, h₂). The pressure at sections 1 and 2 is approximately hydrostatic, and wall friction is negligible. Use the continuity and momentum relations to find h₂ and v₂ in terms of (h₁, v₁).