Saline intrusion - borehole pop-up

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An observation borehole is drilled below the saline interface. The saline water rises up the borehole until the hydrostatic pressures counteract the density differences.

This means that the levels of the saline interface measured in the borehole are different from that in the aquifer.

The height of the saline/ freshwater interface in the borehole also depends on the location of the borehole response zone.

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