Numerous empirical models exist for soil hydraulic properties including soil water retention curve, unsaturated hydraulic conductivity and difiusivity. It has generally been recognized that the empirical fitting coefficients in these models are somehow related to soil texture. By using the concept of fractal geometry, Tyler and Wheatcraft (1990) proposed a physical conceptual model for soil texture and pore structure, and then a two-dimension fractal model for soil water retention curve was deri...