Abstract
It is known that the soil-water characteristic curve (SWCC) contains important information for understanding the engineering behaviors of unsaturated soils. Best fit equations (or SWCC equations) are commonly used for the representation of the SWCC. As the infiltration into the unsaturated soil is mainly governed by the hydraulic properties of soil, the SWCC equations play important roles in the assessment of the rainwater infiltration. In this paper, four types of SWCC equations were adopted and different applicable suction ranges for four best fit equations are investigated and discussed. The fitting parameters and input values in these best fit equations are also demonstrated and discussed. The residual volumetric water content (or residual saturation) as defined in the original equations was recommended to be considered as an input value for a rough estimation of the residual condition. Parametric studies were also carried out to investigate the effects of different fitting parameters on the estimation of SWCC variables and hydraulic conductivities.
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