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Darcy’s law in some cases is not valid in ______

(a) clay

(b) silt

(c) fine sand

(d) coarse-gravel

I had been asked this question in an interview for internship.

The query is from Permeability topic in section Permeability of Geotechnical Engineering I

1 Answer

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Best answer
Right option is (d) coarse-gravel

The explanation is: The flow conditions in clay, sit and fine sand will be laminar, but whereas in the voids of the coarse gravel it will be a turbulent flow.

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