Fig. 4. Position of the water table for a net infiltration of 200 mm yr^–1 and rock hydraulic conductivity of 10^–8 m s^–1 based on (a) the homogeneous simulations and (b) the mean of the heterogeneous simulations. Lines 2 through 6 correspond to various specified values for hydraulic head at the lower boundary (units in meters). The upper boundary of the model and the soil–rock interface are indicated with broken lines.