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How do perched water tables occur?

Perched Aquifers

A water-table (or "unconfined") aquifer is generally composed of two zones: an upper zone (the "unsaturated zone") that is dry or damp, and a lower saturated zone that yields water to a well. But sometimes the upper, unsaturated zone includes a layer that is impermeable - infiltrating water piles up on it and results in a perched water table that is closer to the surface than the main water table.

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