Hi,
So far, I have the understanding that you can add edges between nodes, however, not different type of edges.
In a watercourse, one would have several hydro power plants, reservoirs, etc.. and different water routes and flood routes connecting these objects (nodes). These connections would be of different type of edges, which seems to be a lacking feature in FDM if I am correct. Having this function available in FDM would be helpful in developing a data model for our water courses :)