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- That portion of the water below the surface of the ground whose pressure is greater than atmospheric pressure.
- Subsurface water, accumulating because of seepage and returning to the surface as springs and through wells.
- That part of the subsurface water that is in the zone of saturation, including underground streams.
- Water in the ground that is in the zone of saturation, from which wells, springs, and ground-water run-off are supplied. This is not the same as underflow.
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