A subsurface rock, soil or sediment unit that does not yield useful quanties of water. Porous formation that absorbs water slowly but will not transmit it fast enough to furnish an appreciable supply for a well or spring.
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A subsurface rock, soil or sediment unit that does not yield useful quanties of water. Porous formation that absorbs water slowly but will not transmit it fast enough to furnish an appreciable supply for a well or spring.
Related terms: