Allied & ICAR Exam Bank • ALLIED_0907 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Soil Conservation Structures

Subtopic: Soil Conservation Structures

Question Statement:

Seepage losses in farm ponds excavated in permeable sandy soils are most cost-effectively controlled using:

Options:

  • (A) Bentonite clay incorporation or buried low-density polyethylene (LDPE) geomembrane sheet ($250-300\text{ \mu m}$)
  • (B) Pouring salt into the pond
  • (C) Planting trees inside the pond
  • (D) Compacting dry sand

Answer Key:

A

Step-by-Step Solution & Explanation

Sodium bentonite clay swells 10-15 times to seal pore voids, while buried LDPE films create an impervious barrier eliminating
gt;95\%$ of seepage.
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