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Q: I am reading an initial water level into the model to fill the depressions. I am adding the following to my .tcf file: Read Grid IWL == ..\model\grid\pit_filled_dem.flt However i can an error to say that the command is ambiguous. A: If using a Read Grid IWL, this needs to be read into the geometry control file (.tgc) and not the .tcf. If you move the command to the .tgc this should resolve the issue. Please note that any other IWL commands (such as Set IWL) should also be moved to the .tgc file, otherwise these will overwrite the values in the grid.