Allied & ICAR Exam Bank • ALLIED_0472 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Gully Control and Drop Spillways

Subtopic: Gully Control and Drop Spillways

Question Statement:

In a straight drop spillway, cutoff walls and toe walls are provided primarily to:

Options:

  • (A) Prevent piping failure caused by subterranean seepage under and around the structure
  • (B) Increase aesthetic appearance
  • (C) Support vehicle traffic
  • (D) Reduce concrete curing time

Answer Key:

A

Step-by-Step Solution & Explanation

Cutoff walls lengthen the seepage path (creep length), reducing hydraulic exit gradient and preventing piping.
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