ABSTRACT
Soil hydraulic conductivity is the dominant factor in designing subdrainage installation (Ohize, 1999). It influences the quantity of water that can be drained from a unit area of land per unit time. Various approaches, methods and procedures alongside some theories and hypotheses, have been used to determine the value of soil hydraulic conductivity both on the field and in the laboratory. Various physical and mathematical models have also been developed for estimation of soil hydraulic conductivity (Kozeny, 1927 reviewed by Carman, 1937; Fair and Hatch, 1933; Childs and Collis-George, 1950; Marshall, 1957). Kirkham (1946) proposed a method for measuring soil hydraulic conductivity in the field when a water table is present, a condition which adequately reflects the horizontal component of soil hydraulic conductivity, and that Luthin (1973) regards as dominant and most important in drainage engineering.
