Aquiclude
Aquiclude is the geological formation that is impermeable to the flow of water.
It may be considered as closed to water movement even though it may contain large amount of water due to its high porosity. Clay is an example of aquiclude.
These are the impervious formations which contain water but are not capable of transmitting or supplying a sufficient quantity.
Reference : Engineering hydrology by K. Subramanya
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