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Hi, I have built a 1d/2d model with extended sections in ISIS model and link to TUFLOW but found that there is a 'jump' in water level between between the two ISIS nodes going from ISIS to TUFLOW. I have tried to applied an 's' flag on the hx lines along the floodplain but it doesn't seem to make any difference. The attached long profile shows that the water level 'jumps' from node CHE0_029(ISIS only extended section) to CHE0_030(ISIS/TUFLOW). I use the normal method of linking using hx line. (HX line in pink, CN line in green, CD polygon in blue, ISIS node in red) Any suggestions to improve the transition at the boundary between extended section in ISIS to floodplain in TUFLOW, please?