A channel with a mild slope is followed by a horizontal

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A channel with a mild slope is followed by a horizontal channel and then by a steep channel. What gradually varied flow profiles will occur?

1. M₁, H₁, S₁
2. M₂, H₂, S₂
3. M₁, H₂, S₃
4. M₁, H₂, S₂

Correct Option: D

The given profile: y > y_n > y_c, i.e. m₁.
From horizontal to steep sloped, there will be draw down.
∴ it is H₂ and on steep sloped channel, it is S₂.