Section 4: Soil and Water Conservation Engineering
Soil and Water Erosion
Subtopic: Terraces and bunds
Question Statement:
Contour bund is constructed on a land with S per cent slope. If the length of each contour bund is L and vertical interval is D, then the number of contour bunds per hectare of land area is
Options:
(A) S/LD
(B) LD/S
(C) 100S/LD
(D) 10⁴S/LD
Official Answer Key:
C
Step-by-Step Solution & Explanation
Horizontal interval (spacing between successive bunds) HI = VI×100/S = 100D/S (m), where VI=D is the vertical interval and S is the percent slope. Area commanded by one bund = L × HI = 100LD/S (m²). Number of bunds per hectare = 10,000 m²/(area per bund) = 10,000/(100LD/S) = 100S/(LD), matching option (C).
Section 5 — Irrigation and Drainage Engineering
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