on sections concurrent with waterway: yes (so maybe 26km long, maybe split in parts and shorter but still long sections)
I see that such interpretation is not liked, but is there a better way to represent the situation? surface=water does not seem better to me and seems even less liked by OSM community based on thumbs up/down
highway=aquatic sounds like ship/canoe/kayaking route
I like neither ford=yes nor surface=water since itās neither a crossing nor are the hikers going to walk on water, though I guess if I had to decide Iād pick ford=yes. Something like flooded=yes would fit the best.
Arenāt most streams foot=yes though? foot=yes just means āyou can and may walk hereā. This particular stream however is a trail that is regularly used by people to reach a destination. So itās a highway-feature.
Why would we do that? That place is a well known and managed tourist attraction, visited by hundreds of people daily. The trail leading up the gorge to the cave could not be much more formal:
I have checked a couple of those and all of them have in common, that they are used to cross a stream (which is what a ford is made for), even if it is necessary to walk in the streambed for 5 or 10 meters. Nothing comparable to the situation in the OP.
I still think the best way to depict the situation on the ground is to map 2 ways, one for the stream and one for the path. I wouldnāt mind if the path gets the additional tag surface=water or flooded=yes. Both tags are in use (507 vs. 49 times) so I canāt see a problem in using either.