Permeability of soil is a property which indicates the ease with which water will flow through the soil. This is an important engineering property which governs seepage under dams, the squeezing out of water from a soil sample by the application of a load, drainage of sub-grades, dams, etc. The effective strength of soil is often indirectly controlled by its permeability. Permeability depends on numerous factors, including particle size and shape, fines content, density and degree of saturation. Hence it is determined directly by laboratory methods using a permeameter. There are two of permeameters, Constant Head Permeameter and Variable Head Permeameter. Variable Head permeameters mostly used for testing remoulded or undisturbed fine grained soils. Constant Head Permeameters are used for cohesion-less, coarse grained soils.