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You can run this yourself, for an area you're
You need `cargo install` the `osm-lump-ways` tools ( src: <https://github.com/amandasaurus/osm-lump-ways>), and checkout the config files for WWM, you really just need the definition of flowing water: <https://github.com/amandasaurus/waterwaymap.org/blob/main/flowing_water.tagfilterfunc>. Then just `osm-lump-ways-down -i INPUT.osm.pbf -F @flowing_water.tagfilterfunc --flow-follows-tag name --grouped-ends ends.geojson --grouped-ends-max-distance-m 10e3`, and boom, you've got something you can open & style in QGis.