Q. What is an impermeable formation which contain water but are not capable of transmitting or supplying a sufficient quantity?
Solution:
An aquitard is a zone within the Earth that restricts the flow of groundwater from one aquifer to another. A completely impermeable aquitard is called an aquiclude or aquifuge. Aquitards comprise layers of either clay or non-porous rock with low hydraulic conductivity.
Aquifer is a body of permeable rock that can contain or transmit groundwater
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