Permeability Apparatus
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 Permeability of soil is an important property. The estimation of which is essential for many engineering problems like de-watering, yield of water bearing strata , seepage through and stability of earth dams and embankments as affected by seepage and settlements.
The property of the soils which permits water (fluids) to percolate through its continuously connected void is called its permeability.
Depending upon the value of reynolds number the flow of water through soils may be ‘laminar’ or turbulent. In laminar flow, a particle of water starting from a given position follows a definite path without crisscrossing the path of other particles. In turbulent flows the particles do not follow any definite path but have random, twisting and crisscrossing path.
For laminar and steady flow, according to darcy’s law the rate of flow of water is proportional to the hydraulic gradient in uniform and homogeneous soils.
is:2720 (part xvii) and astm d2434 recommends two methods for laboratory determination of permeability i. E.,