PWP and GW flow rate plotted against time for tests 1.b and 6.b, which are identical models of 1·5 m soil thickness with slope with no bedrock step (y = 0): (a) 1.b HN31_1.5_0_0 under GW flow infiltration and (b) 6.b HN31_1.5_0_0_R GW flow combined with rainfall