Simplified Relation Model of Soil Saturation Permeability Coefficient and Air-Entry Value and Its Application

Based on the Tao and Kong (TK) model fractal of soil–water characteristic curve, a simplified relationship between saturated permeability coefficient air-entry value is established in this study: ks = k0ψa−2. It shown that soil determined by its maximum pore size. In order to facilitate mutual prediction saturation value, based data five types UNSODA database, comprehensive proportionality constant k0 were obtained: sand 0.03051; clay 0.001878; loam 0.001426; sandy 0.009301; silty 0.0007055. obtained air intake kinds soils existing literature SoilVision database calculated. Comparing calculated with measured one, results showed simplifies traditional method some extent can effectively predict different soil. On whole, better predicts for sandy, clay, than loam.