Hi Dave,

I agree about monsooon or snow melt.
Regarding industrial operations involving downstream rivers, there are
precise restrictions and perimeters may be publicly displayed like this
https://imgur.com/a/TLhZcgE

Regarding this particular place :
The stream https://www.openstreetmap.org/way/610040431 is dangerous at any
time due to those canals https://www.openstreetmap.org/way/610040433 and
https://www.openstreetmap.org/way/610040432
The canals are locked by automated gates which can send approximately 50
m3/s from the underground aqueduct once open when this plant
https://www.openstreetmap.org/way/305700031 isn't in operation

By a nice sunny summer day you may be highly tempted to go fishing in the
stream down from the regulation canals.
OSM is legit to warns you.

All the best

François


*François Lacombe*

fl dot infosreseaux At gmail dot com
www.infos-reseaux.com
@InfosReseaux <http://www.twitter.com/InfosReseaux>

2018-07-24 11:57 GMT+02:00 Dave F <davefoxfa...@btinternet.com>:

> Hi
>
> 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.
>
> Cheers
> DaveF
>
>
> On 23/07/2018 21:48, François Lacombe wrote:
>
> Hi,
>
> 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:
> https://imgur.com/a/QUxuPem
>
> 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)
> https://imgur.com/a/TLhZcgE
>
> 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
>
> François
>
>
> _______________________________________________
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>
>
>
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