14.6.2. Hydraulic Radius for Different Channel Shapes

Try these first

1. 1.

   What is the formula for hydraulic radius?

   Hint

   Remember the area divided by what?

2. 2.

   Define wetted perimeter.

   Hint

   Look for the submerged boundary lines.

3. 3.

   What is hydraulic radius?

   • A = P
   • R = A/P
   • P = A

   Hint

   Focus on the definition you've learned.

4. 4.

   Is hydraulic radius important for open channel flow?

   • True
   • False

   Hint

   Think about its applications discussed in class.

5. 5.

   A circular channel has a flow depth of 1.2 m. Calculate the hydraulic radius if the segment's angle is 60 degrees. Use geometric properties of circular segments in your calculations.

   Hint

   Consider the radius of the circle and trigonometric relationships.

6. 6.

   A trapezoidal channel has a bottom width of 6 m, a depth of 2 m, and side slopes of 1:1. Calculate the hydraulic radius and discuss how this shape would influence flood control in a region.

   Hint

   Look at both flooding dynamics and channel hydro-dynamics.