Fig. 4. Soil profile and discretisation for the test problem. Soil hydraulic parameters were _S = 0.4, h_e = -10 cm, = 1/3, and K_S = 2 cm h^-1 for the sandy soil and _S = 0.5, h_e = -40 cm, = 1/9, and K_S = 0.2 cm h^-1 for the clayey soil, with = 2/ + 3. Precipitation was 2.5 cm h^-1 for the first 10 h while potential evaporation was constant at 0.05 cm h^-1 for the 400 h of the solution.