Section 4: Soil and Water Conservation Engineering
Soil and Water Erosion
Subtopic: Terraces and bunds
Question Statement:
The following design parameters of contour bunds constructed on a land of 4% slope are given: V.I. = 1.2 m, base width = 2.5 m, top width = 0.5 m, height = 1.0 m. Assuming the length for side and lateral bunds as 30% of the length of contour bunds, the land area lost due to bunding is
Options:
(A) 0.156%
(B) 2.50%
(C) 10.83%
(D) 12.52%
Official Answer Key:
C
Step-by-Step Solution & Explanation
Horizontal interval (spacing) between bunds = V.I./slope = 1.2/0.04 = 30 m. Land occupied by the bund footprint (ground contact = base width) per unit length of contour = base width/spacing × 100 = 2.5/30 × 100 = 8.33%. Adding 30% extra length for side and lateral bunds: 8.33% × 1.30 = 10.83%.
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