An improvement to the one‐step outflow method for the determination of soil water diffusivities

A simple, quick, and reliable iterative method for the determination of the D-Θ relationship, based on the outflow analysis, is presented. This method imposes no restriction on the functional D(Θ) relationship and gives better results than other previous methods even in cases of extreme nonlinearities in the InD(Θ) relationship and in cases where the D(Θ) relationship is not monotonous. The present method, an improvement to the already existing methods, has been verified against simulated and measured one-step pressure outflow data.