6.7. Proving Energy Loss in Hydraulic Jumps

Try these first

1. 1.

   Define a hydraulic jump.

   Hint

   Think about flow changes next to spillways.

2. 2.

   What does a Froude number greater than 1 indicate?

   Hint

   Recall the relationship between flow states.

3. 3.

   What is the Froude number for a flow with speed 5 m/s and depth 0.3 m?

   • 3.048
   • 5.0
   • 2.0

   Hint

   Calculate using the known formula.

4. 4.

   True or False: A hydraulic jump reduces flow energy.

   • True
   • False

   Hint

   Think about flow conditions right before and after the jump.

5. 5.

   In a rectangular channel with a width of 2 m, given a discharge of 4 m³/s and an upstream depth of 0.5 m, calculate the sequent depth and energy loss.

   Hint

   Start with finding the velocity using Q/A.

6. 6.

   Derive the relationship for energy loss based on the changes in y1 and y2 in a hydraulic jump.

   Hint

   Recall the use of terms for kinetic and potential energy.