Question

Contour bunds are recommended on the land slopes:

• A. Up to 2%
• B. Up to 6%
• C. Up to 10%
• D. Up to 12%

Hint:

Soil conservation methods are specific to land slope. Remember these general guidelines: - \textbf{Contour Bunding:} Slopes up to 6% - \textbf{Graded Bunding:} Used in areas of higher rainfall on similar slopes. - \textbf{Bench Terracing:} Slopes from 16% to 33%

Answer 1

The Correct Option is B

Step 1: Understand the purpose of contour bunds. Contour bunds are small earthen barriers constructed along the contours of the land. Their primary purpose is to conserve soil and water by reducing the velocity of runoff, preventing soil erosion, and increasing water infiltration.
Step 2: Identify the appropriate slope range. Contour bunding is most effective on gentle to moderate slopes where runoff can be safely managed. For steep slopes, this method becomes ineffective and can even be dangerous, as the bunds may fail under high water pressure. Generally, contour bunds are recommended for agricultural lands with slopes up to 6%. For steeper slopes, other measures like bench terracing are used.