Discussion
What is the specific capacity of a well that is pumping at 249 lpm, has a static water level at 5 m and pumping water level of 6.50 m ?
Answer: A
The specific capacity is 166 lpm per metre of drawdown.
Specific capacity is the pumping rate divided by the drawdown, the fall from the static water level to the pumping level:
\[ \begin{aligned} s &= 6.50 - 5.00 = 1.50\ \text{m} \\ SC &= \frac{249}{1.50} = 166\ \text{lpm/m} \end{aligned} \]
Dividing by the pumping water level instead (249/6.5) gives about 38, and dividing by the static level gives about 50, so neither produces another option. 373.5 is the pumping rate multiplied by the drawdown rather than divided by it.
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