Hi
Added a few stream and river sidestreams but the qualification ‘role’ only set in the rivsr/stream relation. Did not break the flow map as shown in Amanda’s waterway map. Do use the sort function in the JOSM relation editor but if that has influence i do not know.
See `osm-river-basins`: Website to show how are rivers in OSM connected
Ciao
edit: No river/stream main splitting, the side-stream just bolted on as river/stream where the diversion starts/ends and added to the relation, where named.
waterways part of boundaries… very often yes, can’t care sorting those but think it will only count in the relations, not the mapping itself.