RESEARCH ARTICLE Permeability of well graded soils

Coefficient of permeability (k) values can be determined us-ing a variety of on-site and laboratory methods. Indirect infer-ence from the grading curve is a standard method used to deter-mine the k factor of fine granular soil types [12, 13]. However, measurements and calculations may introduce inaccuracies in several ways- for instance, by ignoring the coefficient of irreg-ularity