How is specific capacity calculated for a well?

Study for the Water Treatment Class E Test. Prepare with flashcards and multiple choice questions, each question features hints and explanations. Get ready for your certification exam!

Specific capacity is a measure of a well's efficiency and productivity, indicating how much water can be extracted from the well per unit of drawdown. It is calculated by taking the well yield, which is the amount of water produced from the well over a specific time period, and dividing it by the drawdown, which is the difference in water level in the well before and during pumping.

The formula for specific capacity is thus expressed as well yield divided by drawdown, which yields a result in gallons per minute per foot (gpm/ft). This metric helps in assessing the performance of a well and can be used for comparative analysis with other wells.

In this case, since we know that specific capacity is defined as the well yield divided by the drawdown, the correct answer aligns perfectly with this definition. The other options involve incorrect arrangements of the terms, which do not accurately correspond to the established formula for calculating specific capacity.

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