Section 4: Soil and Water Conservation Engineering
Soil and Water Erosion
Subtopic: Gully control structures – drop, drop inlet and chute spillways
Question Statement:
The most suitable hydraulic structure for conveying water from higher elevation to lower elevation across the earthen bund is
Options:
(A) Drop structure
(B) Pipe drop structure
(C) Chute spillway
(D) Gabion structure
Official Answer Key:
B
Step-by-Step Solution & Explanation
To safely convey water through (across) an earthen bund/embankment from a higher to a lower level without eroding the embankment, a pipe drop structure (a conduit passing through the bund with an inlet riser and outlet energy dissipator) is the standard choice → option (B). A plain drop structure or chute spillway is normally used over/along a bund face rather than through the embankment body, and gabion structures are erosion-protection/retaining works, not conveyance structures.
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