6.1. Conditions for Maximum Discharge

Try these first

1. 1.

   Define normal depth in a channel.

   Hint

   Think about stable flow conditions.

2. 2.

   What does the hydraulic radius represent?

   Hint

   Consider the relationship between area and perimeter.

3. 3.

   What is the hydraulic radius formula?

   • A/P
   • P/A
   • A+P

   Hint

   Remember, it’s a ratio!

4. 4.

   True or False: Manning's equation is only applicable for rectangular channels.

   • True
   • False

   Hint

   Think beyond rectangles!

5. 5.

   For a trapezoidal channel with a bottom width of 8m, a side slope of 1.5:1, and a depth of 4m, derive the expression for maximum discharge.

   Hint

   Focus on integrating area calculation with Manning's components.

6. 6.

   Design a circular drainage pipe with specific criteria: diameter of 1.2m, depth of 0.5m, and slope of 1 in 500. Find its maximum discharge.

   Hint

   Refer to sector area minus triangular area for accurate calculations.