Fluid Mechanics Open Channel Flow Gradually Varied

In subcritical flow in a channel, Δzm represents the maximum height of a hump that can be built without causing any change in the upstream water surface. If a hump of height Δz < Δzm is built, then

1
the upstream water surface will be lowered
2
the flow over the hump will be critical
3
the flow over the hump will be supercritical
4
the flow over the hump will be subcritical

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