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Question
A soil formation through which only seepage is possible, being partly permeable and capable of giving insignificant yield, is classified as
A.
Aquifer
B.
Aquitard
C.
Aquifuge
D.
Aquiclude
Answer ( Option B)

Aquitard

Solution

Aquitard is that geological formation which does not yield water freely to wells due to its less permeability, although seepage is possible through it. The yield from such formation is thus insignificant.
 
Note:
1. Aquifer: These are the geological formations which are both permeable and porous. Hence, sufficient discharge can be obtained through it.
Ex. Fine sand and Coarse silt
2. Aquiclude: These are the geological formations which are highly porous but impermeable. Hence, water cannot be extracted through them
Ex. Clay
3. Aquitard: These formations are porous but less permeable. Hence, water does not flow through them but instead it seeps
Ex. Sandy clay.
4. Aquifuge: These formation are neither porous nor permeable
Ex. Granite rock.

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