16.1.2. Department of Civil Engineering

Try these first

1. 1.

   Define specific energy in an open channel flow.

   Hint

   Think about how you measure energy in terms of height and velocity.

2. 2.

   What does a Froude number less than 1 signify?

   Hint

   Consider situations where gravitational forces dominate.

3. 3.

   What is specific energy?

   • Energy per unit area
   • Energy per unit weight
   • Energy per volume

   Hint

   Think about how we measure energy in physics.

4. 4.

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

   • True
   • False

   Hint

   Recall the definitions of flow types.

5. 5.

   A trapezoidal canal has a base of 8m, with side slopes of 1:2, and a discharge of 4m³/s. Determine the flow depth and hydraulic radius.

   Hint

   Break down the trapezoid into components.

6. 6.

   A rectangular channel sees a hydraulic jump, with parameters leading to an upstream Froude number of 3. Calculate the energy losses due to the jump.

   Hint

   Use the defined equations for specific energy to find E_1 and E_2.