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A well yielding 900 litres a minute at a drawdown of 6 m has a specific capacity of

  • A.5400 litres/min per metre
  • B.0.0067 litres/min per metre
  • C.94 litres/min per metre
  • D.150 litres/min per metre

Answer: D

Correct answer: 150 litres/min per metre

Specific capacity is yield over drawdown:

\[ \frac{900}{6} = 150 \ \text{litres/min per metre} \]

It is the standard measure of well performance, and recording it at commissioning gives the baseline against which later deterioration is judged - which is exactly what the next item does.

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