I created https://wiki.openstreetmap.org/wiki/Key:nhd:fcode https://wiki.openstreetmap.org/wiki/Key:nhd:ftype https://wiki.openstreetmap.org/wiki/Key:nhd:reach_code https://wiki.openstreetmap.org/wiki/Key:nhd:com_id about tags added in imports.
Review is welcomed, especially the first two where I described tags with over 250 000 uses as pointless and unwanted.
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