The 'perched aquifer' is formed when:
Choose the correct answer
A confined aquifer under pressure
Impermeable lens intercepts percolation creating a small, isolated saturated zone above the regional water table
An artesian aquifer at great depth
Any aquifer below 100 m depth
Correct Answer
B. Impermeable lens intercepts percolation creating a small, isolated saturated zone above the regional water table
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Perched aquifer: unconfined groundwater body separated from main water table by an unsaturated zone. Formed when: a lens of impermeable (or less permeable) material (clay, hardpan) intercepts downward percolation, creating a saturated zone above the main aquifer. Typically small in area and volume. Can dry up in dry season. Wells in perched aquifer are unreliable for sustained yield.
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