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Drawdown at a well is the difference between the water level

  • A.at the well and at the aquifer's base
  • B.in two adjacent wells
  • C.at the top and bottom of the screen
  • D.before pumping and during pumping

Answer: D

Correct answer: before pumping and during pumping

Drawdown is the lowering of the water level at a point caused by pumping, measured from the static level before pumping began. It is the quantity plotted against time and distance in a pumping test, and its relation to the discharge gives the specific capacity of the well and, through the Theis or Jacob analysis, the transmissivity and storage coefficient of the aquifer.

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