An independent and unconfined volume of groundwater separated from an underlying main body of groundwater by an unsaturated zone; typically occurs above discontinuous impermeable layers.
Perched groundwater is a very specific condition whereby an unsaturated zone underlies a saturated zone. This term is often erroneously used to describe shallow groundwater encountered in trial pits or foundations.
Why is perched groundwater important?
Perched groundwater often supply water to springs used as a source of water by rural communities and animals. These systems are vulnerable to the effects of drought and contamination.