16.1.4. Lec 36: Open Channel Flow III

Try these first

1. 1.

   Define open channel flow.

   Hint

   Think about natural water bodies.

2. 2.

   What is specific energy?

   Hint

   Relates to potential and kinetic energies.

3. 3.

   What is the Froude number's significance in open channel flow?

   • A measure of flow speed relative to gravity
   • A measure of flow depth
   • A measure of energy loss

   Hint

   Consider how gravity influences flow speed.

4. 4.

   True or False: Hydraulic jumps always occur in subcritical flow.

   • True
   • False

   Hint

   Think about the flow direction.

5. 5.

   A rectangular channel is 10m wide with a discharge of 20 m³/s. Calculate the flow depth and determine if the flow is subcritical or supercritical.

   Hint

   Use Q = A * v where A is the area of the flow.

6. 6.

   Design a trapezoidal channel with a discharge of 30 m³/s at a certain slope. What dimensions would minimize energy loss?

   Hint

   Apply optimal design principles for trapezoidal cross-section.