Discussion
If that same well later yields 600 litres a minute at 8 m drawdown, its specific capacity has fallen to
Answer: A
Correct answer: 75 litres/min per metre
Recomputing on the later figures,
\[ \frac{600}{8} = 75 \ \text{litres/min per metre} \]The specific capacity has halved, and since the aquifer is unchanged the well itself must have deteriorated - the screen clogged by incrustation, bacterial growth or fine material. Noticing the trend early makes rehabilitation possible; left long enough, the well is lost.
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