In this article we will discuss about:- 1. Definition of Permeability 2. Darcy's Law (1856) of Permeability 3. Capillarity-Permeability Test 4. Permeability of Stratified Soil Deposits. Definition of Permeability: It is defined as the property of a porous material which permits the passage or seepage of water (or other fluids) through its interconnecting voids. A material having continuous voids is [...]
Determination of Coefficient of Permeability in Laboratory: 1. Constant Head Permeability Test (Coarse Grained): Water flows from the overhead tank consisting of three tubes – The inlet tube, the over-flow tube and the outlet tube. The constant hydraulic gradient i causing the flow is the head h (i.e., difference in water levels of the overhead and bottom tanks) divided by [...]
The soil mass, in the field, consists of several layers of soil deposited one above the other. Each layer may have different coefficients of permeability. The average of permeability of the entire soil deposit depends on the direction of flow with respect to bedding planes. Transported soils usually exist in several layers, each layer with different permeability. For a three-layered [...]