FIG. 8. Schematic representation of the dynamic decrease of the water content-dependent contact angle with time t (Fig. 7a) and positive pressure h (Fig. 7b) in the vicinity of a wetting front. Parameters used were _crit = 2 Vol.-%, _FK = 18 Vol.-%, _max = 110°, _min = 0, characteristic rewetting time t_o = 30 d, breakthrough pressure h_o = 30 cm.