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Hi , I am running a TUFLOW 1D/2D model for a river with tributaries of order 3. The model runs stably at timestep 0.2 when run in 1D domain alone and is free from any 2D file errors or warnings but fails to start the simulation when linked with 2D domain. Options tried : 1. Tried to reduce the initial conditions so that the initial stage is within the banks 2. Tried increasing the dz value in _2d_Zsh_banks..file to increase the elevation at the banks ranging from values 0.1 to 1, the model did run for about 2% at dz value 0.8 but stopped after that. 3. Added different flag combinations for HX lines- such as '2', 'z' 's'. None of the above trials have worked. My confusion is when the model runs in 1D domain, it has to run within the 2D domain also. Am using lidar data as grid to extract zpts with a resolution of about 2 m, hence used the cell size of 1m. I have already crossed the deadline for project submission and really need help in this! Anticipating a quick response Regards, ketaki MB_WS_2D_UPDATED0_006.bmp