Fig. 4. Water transport and matric potentials in 0.25- to 1-mm (left) or 1- to 2-mm (right) porous medium during horizontal transient flow. (A) Cumulative outflow (•) or volumetric water content () () as a function of time. (B) Matric potential gradient across a 7-cm section of medium during transient drainage. (C) Matric potential () as a function of position for different times during transient flow across a 15.24-cm length of porous medium.