groundwater

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groundwater

Water that occurs below the surface of the Earth, where it occupies spaces in soils or geologic strata. Most groundwater comes from precipitation, which gradually percolates into the Earth. Typically, 10–20% of precipitation eventually enters aquifers. Most groundwater is free of pathogenic organisms, and purification for domestic or industrial use is not necessary. Furthermore, groundwater supplies are not seriously affected by short droughts and are available in many areas that do not have dependable surface water supplies.

Variants of GROUNDWATER

groundwater or subsurface water

This entry comes from Encyclopædia Britannica Concise.
For the full entry on groundwater, visit Britannica.com.

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