Experiments testing the topography effects on surface-derived fluid percolation within the detachment. The snapshots have been taken at the same moment (11.1 Myr). The Pe number greater than 1 (in blue) and isotherms (colored lines) and the major streamlines with arrowheads indicating the flow direction (in purple) are represented for the three tested topographies (0m, 500 m and 3000 m). The three diagrams on the left (a, c, e) correspond to the minimum permeability (K_d1) and those on the right (b, d, f) correspond to the maximum permeability (K_d4). Isotherms are indicated in °C.