PERMEABILITY MEASUREMENTS ON DISTURBED SOIL SAMPLES

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Abstract
Laboratory studies are useful where it is not practical or economically feasible to conduct field trials on soil reclamation and movement of water through soils. Disturbed soil samples can be used advantageously to study the relative changes in percolation rate brought about by specific chemical and physical soil treatments. Some of the factors which influence laboratory permeability measurements are discussed briefly. These are: method of detn.; shape and size of permeameter; water outlet; soil retaining screens; water-head control; hydraulic gradient; fluids; viscosity; temp.; direction of water flow; entrapped air; texture; volume wt., and water content during packing; effect of sieve size; packing technique; wetting technique; variability of permeability with time; electrolyte cone; composition of water; and replication.