The program will take the vector stream data, transform them to raster, and subtracts a defaultdepth+additionaldepth from the DEM. If the given width is more than 1 cell it will carve the stream with the given width. With -n option it should eliminate all flat cells within the stream, so when and if the water gets into the stream it will flow. Site option generates x,y,z for points which define the stream with the z value of the bottom of the carved-in stream. These sites can then be combined with contour sites to interpolate a new DEM with better representation of valleys.
g.region rast=elevation.10m -p r.carve rast=elevation.10m vect=streams out=carve_dem width=20 depth=5
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