RAPID METHOD FOR ESTIMATING THE UNSATURATED HYDRAULIC CONDUCTIVITY FROM INFILTRATION MEASUREMENTS

A method is proposed for estimating the unsaturated hydraulic conducti vity from observed infiltration data. Infiltration measurements are ge nerally easier to obtain than experimental data required for in situ d etermination of the hydraulic conductivity. The problem was formulated in terms of a nonlinear least-squares parameter optimization method w hich combines Philip's two-term infiltration equation with an analytic al description of the unsaturated soil hydraulic properties according to Mualem and van Genuchten. Reliable estimates for the hydraulic para meters could be obtained with an inverse procedure when independently measured water retention data were included. The results indicate that soil water content measurements at very low values of the soil water pressure head are especially important to ensure parameter uniqueness. The method provides rapid and cost-effective estimates of the hydraul ic properties of field soils.