My inundation mapping is limited to the extent for which i have cross section data (from the most left to the most right station), but why? I would like ras mapper to inundate everything which is below WSE . How can I perform this ?
HEC-RAS generates a interpolation surface from the cross-sections (can see it in Mapper), this is what it uses for the mapping. This is no different that how GeoRAS worked and you have to modify it manually in another software or modify your cross-sections to be longer. .