Definition of Permeability | Pervious and Impervious soil

Thursday, October 20, 2011 20:29
Posted in category Soil Mechanics 1
Views: 4,321 views

  • Permeability:

It may be defined as

“It is a measure of the ease with which water flows through soils and/or rocks.

Soil is a porous media it is a particulate material which consist of solid grains and have voids between them. When they are subjected to different heads they allow water to seep through them, under saturated condition they are filled with water, the voids in it are interconnected. The easiness provided to the water to pass through a specific sol is known as permeability of that soil or rock. It is impossible for a soil to be completely impermeable, there are some soils which are very less permeable but they cannot be considered as impermeable.

  • Pervious soil:

It may be defined as

β€œThe soil which offers the minimum possible resistance to the flow of the water is called as pervious soil.”

The examples of such type of soils include coarse grained soils. Their permeability ranges from less than 1/100 to 1/100000 m/sec, while the soils offering maximum resistance are called as impervious.

  • Impervious Soil:

It may be defined as

β€œSoils which offers the maximum possible resistance to the flow of water are called impervious.”

The impervious soil have permeability less than or equal to 10-8 m/sec.

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