In Russia we have a tool which helps to correct some types of topological errors in river systems.
http://dezhin.gis-lab.info/yav/?zoom=8&lat=55.37264&lon=39.44807&layers=BFFFFFTT(sorry, it's in russian) red markers - mouths without continuing magenta markers - nodes of which flow out multiple rivers, but no one does not fall into If you want, then I can share the source code and help in setting up this tool. It uses osm2pgsql, sql, mapserver and openlayers.
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