5. Hydraulically Efficient Triangular Section

Try these first

1. 1.

   What is the formula for hydraulic radius?

   Hint

   Think about what hydraulic radius represents.

2. 2.

   Define wetted perimeter.

   Hint

   What length do you measure in the context of flowing water?

3. 3.

   What is the primary purpose of calculating the hydraulic radius?

   • To determine flow efficiency
   • To measure water depth
   • To calculate channel width

   Hint

   Think about what Radius means in this context.

4. 4.

   True or False? A larger wetted perimeter is always better for hydraulic efficiency.

   • True
   • False

   Hint

   Consider the formula for hydraulic radius.

5. 5.

   Design a triangular drainage section that maximizes flow for a given slope and roughness. Define the parameters and show calculations.

   Hint

   Consider maximizing the hydraulic radius to enhance discharge.

6. 6.

   Using the principles from this section, derive the hydraulic radius formula when the side slope m changes from 1 to 2.

   Hint

   Focus on relating the changes in m directly to R.