A mild-sloped channel is followed by a steep-sloped channel.

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A mild-sloped channel is followed by a steep-sloped channel. The profiles of gradually varied flow in the channel are

1. M₃, S₂
2. M₃, S₃
3. M₂, S₁
4. M₂, S₂

Correct Option: D

Mild slope: y_n > y > y_c
Steep slope: y_c > y > y_n
∴ It is m₂, S₂.