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Groundwater

A zone around...

Question

A zone around a sand drain in which decrease in coefficient of permeability in the horizontal direction occurs due to remolding of clay is called.

A

Active zone

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B

Shear zone

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C

Sensitive zone

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D

Smear zone

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Solution

The correct option is D Smear zone
A smear zone in a sand drain is created by the remolding of clay during the drilling operation for building it. This remolding of clay results in a decrease of permeability in the horizontal direction.

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