Discussion
A tunnel driven below the water table in permeable rock will
Answer: A
Correct answer: act as a drain and lower the water table
A tunnel below the water table in permeable rock is an enormous drain at atmospheric pressure, so water flows into it and the table falls around it, sometimes over a wide area. The consequences reach beyond the works: springs dry up, wells fail, and settlement may follow where the drawdown consolidates compressible ground.
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