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- (environment) Geological formation that may contain groundwater but is not capable of transmitting significant quantities of it under normal hydraulic gradients. May function as confining bed.
Source: Terms of the Environment
- A layer of rock having low permeability that stores groundwater but delays its flow.
- Low-permeability bed, in a stratigraphic sequence, of sufficient permeability to allow movement of contaminants, and to be relevant to regional ground-water flow, but of insufficient permeability for the economic production of water. See also: aquifer; aquiclude. CF: confining bed
Source: Dictionary of Mining, Mineral, and Related Terms