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​​​​​​A rectangular channel with Gradually Varied Flow $\text{(GVF)}$ has a changing bed slope. If the change is from a steeper slope to a steep slope, the resulting $\text{GVF}$ profile is

  1. $S_{3}$
  2. $S_{1}$
  3. $S_{2}$
  4. either $S_{1}$ or $S_{2}$, depending on the magnitude of the slopes
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