Soil and Water Erosion: Mechanics of soil erosion - wind and water erosion: soil erosion types, factors affecting erosion; soil loss estimation; biological and engineering measures to control erosion; terraces and bunds; vegetative waterways; gully control structures, drop, drop inlet and chute spillways; earthen dams.
On a 4% land slope in a medium rainfall zone, the horizontal spacing of bunds (m) and the length of bunds per hectare (m), respectively, are
Options:
(A) 25 and 300
(B) 25 and 400
(C) 30 and 300
(D) 30 and 400
Official Answer Key:
B
Step-by-Step Solution & Explanation
For contour/graded bunding design, the horizontal interval (spacing) between bunds is read from standard slope–rainfall-zone design tables (e.g. as used in Indian SWC practice): for a 4% slope in a medium rainfall zone, the recommended horizontal spacing is 25 m.
Length of bund required per hectare = (area per ha)/(horizontal spacing) = 10,000 m²/ha ÷ 25 m = 400 m/ha. Answer: (B) 25 and 400.
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