This is another one of those discussion which comes up every year or so.

The perception of danger is subjective; which never fits well within OSM.

Waterways are not dangerous in themselves. They are inanimate objects. They don't jump out & attack you as you walk by. It's the naive way people interact with them which causes injury.

If there's a sign indicating danger, tag that.


On 23/07/2018 21:48, François Lacombe wrote:

As the discussion about intermittent/seasonal/... on waterways goes on, there is another thing to map: how waterways banks can be dangerous due to sudden rise or lower water level. It is actually related to what we intend to map with intermittent or seasonal.

For example in France, we often find such warning signs:

Precise sections of streams or rivers are marked as dangerous even in good weather. It is stronger than simple intermittence or seasonality because of industrial activities running upstream (mainly hydroelectric power generation or dam operation). Nevertheless, I didn't find any global database or public information displaying data about such particular flooding situations. OSM can be one of this kind.

Here is a public display next to a power plant in French Alps (with a nice piece of OSM without attribution)

Then what could be the best way to tag it?
No existing tag sounds suitable for this, even the idea of a single "permanence" key.

All the best


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