I am using the script r.inund.fluv. I run the script with all the required parameters and it produced a lot or errors.
I emailed the author of the script and he said that
"I think you are not using a cartesian coordinate system... ("The DTM resolution is 0:00:03 x 0:00:03 meters") and the code work with a cartesian grid. "
I'm using a raster map from SRTM for the elevation. Its DTM resolution is 0:00:03 x 0:00:03 meters. As what is required for the script to work, the author said that I should convert it to a cartesian coordinate system. How is it done for a raster SRTM map?