16.7. Best Hydraulic Cross Section

Try these first

1. 1.

   What is specific energy in open channel flow?

   Hint

   Think about energy divided by weight.

2. 2.

   Define Froude number.

   Hint

   It's about comparing flow velocity with something to do with waves.

3. 3.

   What does a Froude number of 0.8 indicate?

   • Supercritical Flow
   • Subcritical Flow
   • Critical Flow

   Hint

   Think about flow speed compared to waves.

4. 4.

   True or False: Hydraulic jumps are beneficial for mixing.

   • True
   • False

   Hint

   Consider the role of turbulence in fluids.

5. 5.

   Given a rectangular channel with a specific energy of 4.5 meters and a velocity of flow of 8 m/s, what is the flow depth?

   Hint

   Break down the specific energy equation.

6. 6.

   A trapezoidal channel designed for an agricultural return flow has a side slope of 1:2 and a depth of 1.5 m. What is the best width for minimizing resistance?

   Hint

   Think about how side slopes influence the area and perimeter.