Question

Graded bunding has been generally used in areas receiving rainfall more than {

• A. \(600\ \text{mm/year}\)
• B. \(400\ \text{mm/year}\)
• C. \(200\ \text{mm/year}\)
• D. \(450\ \text{mm/year}\)

Hint:

Graded bunds are useful in higher rainfall areas because they allow safe disposal of excess runoff.

Answer 1

The Correct Option is A

Concept:
Bunds are soil and water conservation structures. They may be contour bunds or graded bunds depending on rainfall and drainage requirement.

Step 1: Understand graded bunding.
Graded bunds are constructed with a mild longitudinal grade so that excess runoff water can be safely drained.

Step 2: Rainfall condition.
Graded bunding is generally suitable in relatively higher rainfall areas where safe disposal of excess runoff is required.

Step 3: Select rainfall value.
It is generally used where rainfall is more than: \[ 600\ \text{mm/year} \] \[ \therefore \text{Correct Answer is (A)} \]