Allied & ICAR Exam Bank • ALLIED_1249 MCQ • 1 Mark

Section 5: Irrigation and Drainage Engineering

Well Hydraulics and Groundwater

Subtopic: Interference of Wells

Question Statement:

When two identical pumping tube wells are installed within each other's radius of influence, the mutual well interference causes:

Options:

  • (A) An increase in total drawdown and a decrease in individual well discharge
  • (B) A decrease in total drawdown
  • (C) An increase in discharge for both wells
  • (D) Zero effect on drawdown or discharge

Answer Key:

A

Step-by-Step Solution & Explanation

Overlapping cones of depression superimpose drawdowns ($s_{combined} = s_1 + s_2$), increasing total pumping lift and throttling the specific capacity and discharge of both wells.
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