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Groundwater fills the spaces between soil particles and fractured rock beneath the Earth's surface.

Groundwater is the water found underground that fills voids in the soil, sand, and rock. It is a source of water for many deep rooted plants and can be harvested through wells.

Depletion of groundwater is caused by

Overuse of groundwater can lead to depletion and lowering of the water table, increased user costs, reduced surfwace water supplies, land subsidence, and water quality concerns.[1]

Groundwater levels can be recharged through swales.