I downloaded the latest hydrology for the country from the USGS site.  I open it in QGIS and export an area I want to work on as kml files, then open in Garmin Basecamp, then export the streams I want to add as gpx files, then I add them in JOSM.  I am not adding the tags.  Is it an issue I should worry about?  Should I delete the tags?  Is there a way to avoid the tags being created?  I have a really hard time figuring out JOSM.  Thanks.