|Classification of waterway section in National Hydrography Dataset|
|Used on these elements|
|Tools for this tag|
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:fcode=46003 means "intermittent stream". On waterway=stream with intermittent=yes is a pointless duplication. And on anything else it is confusing and also unnecessary.
See National Hydrography Dataset#Attribute to tag_mapping for equivalence assumed in some imports.
- nhd:ftype=* carrying similar information but in a human readable form.