Fig. 2. Cross-sections of four source strength infiltration simulations ( = 12 m^–1 and S_e0 = 0.6, and q/K_S ranges from 1 mm to 10 cm), showing effective water saturation S_e and electrokinetic potential V (mV) vs. depth (from 0 to 60 cm), and its first- and second-order horizontal derivatives at a depth of 10 cm (horizontal electric field E_x [mV cm^–1] and its derivative E'_x [mV cm^–2]). Please note that the distributions are symmetric with respect to the x = 0 vertical plane, and that V and E'_x are even and E_x is odd.