Question

Which of the following is true about hydraulic jump?

- A reduction in slope can cause a hydraulic jump

- in increase in manning's roughness can cause hydraulic jump

- An increase in slope can cause a hydraulic jump

- A smoother steeper channel will cause a hydraulic jump

- A hydraulic jump results in a reduction of total head

- A hydraulic jump results in an increase of total head

Answer 1

Ans : A reduction in slope can cause a hydraulic jump , Increase in manning's roughness can cause hydraulic jump ,  A smoother steeper channel will cause a hydraulic jump, A hydraulic jump results in a reduction of total head

1. A reduction in slope can cause a hydraulic jump because hydraulic jump length increases by decrease or reduction in the slope .

2. Increase in manning's roughness can cause hydraulic jump due to the fact that the channel flow rate decreases as manning`s roughness increases .

3. A smoother steeper channel will cause a hydraulic jump , this would decreases the size of of water that is entering and would cause the hydraulic jump .Due to sudden change in the flow of fluid from supercritical to subcritical .

4. A hydraulic jump results in a reduction of total head due to the fact that some energy is lost in that transition so we call this energy as total head which gets reduced when hydraulic jump occurs .

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