Discussion
An unconfined aquifer of porosity 0.35 and specific retention 0.10 has a specific yield of
Answer: B
Correct answer: 0.25
Porosity divides into what drains and what is held:
\[ S_y = n - S_r = 0.35 - 0.10 = 0.25 \]So a quarter of the aquifer’s volume is recoverable water and the remaining tenth stays held against gravity. It is the specific yield, not the porosity, that determines how much water an unconfined aquifer will actually give up.
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