Allied & ICAR Exam Bank • ALLIED_1156 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Gully Control and Drop Spillways

Subtopic: Drop Spillway Hydraulics

Question Statement:

A straight drop spillway is most structurally and economically suitable for gully control drops of:

Options:

  • (A) Up to 3.0 m drop height
  • (B) Above 15.0 m drop height
  • (C) Drop heights exceeding 25 m
  • (D) Only when discharge exceeds 1000 cumecs

Answer Key:

A

Step-by-Step Solution & Explanation

Straight drop spillways are efficient for stabilizing gully heads with total drops up to $3\text{ m}$ ($10\text{ ft}$). Higher drops typically require chute or drop inlet spillways.
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