PWP and GW flow rate plotted against time for identical models with h = 1·25 m, and bedrock step y/h = 0·6 with step length X₂ = 8·5 m (prototype). A vertical dashed line shows the time of failure. (a) Test 7.a HN31_1.25_0.6_8.5 and (b) test 8.a HN31_1.25_0.6_8.5_R. A zoom of the PWP during failure is shown for each case at left and right, respectively