Issues in results display (Windows at least)
The XY map view is not well scaled : it seems that point (0,0) is included, even when large geographical coordinates are used (see the Selestat case here: https://filesender.renater.fr/?s=download&token=126a8842-0c95-4a74-8d99-3aee277322eb)
In French version, what is the difference between cote and altitude? They seem to be the same thing... "Discharge" should be "Débit". Velocity would be a nice output result to display, as well as flow depth.
The scale of water level is not good (it starts from zero, even when large altimetric coordinates are used). It should be scaled starting from the min bed altitude of the cross-section (and displaying the bed level would be meaningful in terms of flow depth).