I have Contour lines shapefile which I imported that into GRASS and converted to a DEM using the IDW interpolation technique (r.surf.idw with npoints 250). Now I want watershed analysis to be done where I can get Flow accumulation, Flow direction, basin, Stream order, drainage pattern etc.
When I Try to run r.fill.dir after a while GRASS crashes and the process doesn't give any output. I have tried other hydrologic modelling under raster but it does the same.
Can anybody help me out with the procedure of doing this analysis in GRASS GIS.