GATE AG 2017 • Q17 MCQ • 1 Mark

Section 5: Irrigation and Drainage Engineering

Wells and Pumps

Subtopic: Types of wells

Question Statement:

A cavity well is a tubewell which has

Options:

  • (A) gravel pack and a strainer
  • (B) a PVC strainer
  • (C) no strainer
  • (D) a bamboo strainer

Official Answer Key:

C

Step-by-Step Solution & Explanation

• A cavity well develops a natural spherical cavity in a confined aquifer just below an impervious clay layer, formed by the well drawing sand/water from the aquifer until a stable cavity forms. • Because water enters through this naturally-formed cavity rather than through a perforated pipe, a cavity well is characteristically constructed without a strainer. • Final Answer: (C) no strainer

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