Key:nhd:ftype
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 nhd:ftype
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| Description |
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Classification of waterway section in National Hydrography Dataset 
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| Group: references |
| Used on these elements |
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| Status: imported |
| Tools for this tag |
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National Hydrography Dataset ftype classifies a section of waterway. Appearance in OSM is result of NHD imports.
Keeping this tag in OSM is dubious as it is a classification method of objects duplicating OSM classification. For example nhd:ftype=StreamRiver on either waterway=stream or waterway=river is a pointless duplication. And nhd:ftype=StreamRiver on anything except waterway=stream or waterway=river is confusing and also unnecessary.
See National Hydrography Dataset#Attribute to tag_mapping for equivalence assumed in some imports.
See nhd:fcode=* carrying similar information but not in a human readable form.