6.4. Depth Ratio Calculation and Depth After the Jump

Try these first

1. 1.

   What is the Froude number if the velocity is 5 m/s and depth is 2 m?

   Hint

   Use the formula Fr = V / √(gy).

2. 2.

   What happens to the flow when the Froude number exceeds 1?

   Hint

   Remember the classification of flow based on Froude number.

3. 3.

   What does a Froude number greater than 1 indicate?

   • Subcritical flow
   • Supercritical flow
   • Critical flow

   Hint

   Think about the flow characteristics.

4. 4.

   True or False: A hydraulic jump only occurs when flow transitions from subcritical to supercritical.

   • True
   • False

   Hint

   Remember the definition of hydraulic jumps.

5. 5.

   In a spillway, the flow has a Froude number of 8, and depth before the jump is 2.5 meters. Calculate the depth after the jump and energy loss.

   Hint

   Follow the depth ratio and energy loss equations as derived.

6. 6.

   A rectangular channel has a velocity of 10 m/s and a depth of 1 meter before the jump. Determine Froude number before and after the jump if y2 is 5 meters.

   Hint

   Balance flow equations while transforming for velocities.