[Tagging] Adding 'flood' as value to the key 'hazard' (to be used in combination with the tag boundary=hazard)

[Andy Townsend]

On 15/06/2023 16:59, Cornelia Scholz via Tagging wrote:
> Dear all,
>
> I would like to propose to add*'flood'* as value to the *key 'hazard'* 
> (to be used in combination with the tag*boundary=hazard*).
>
...
> What already exists is the key flood_prone 
> <https://wiki.openstreetmap.org/wiki/Key:flood_prone>=*which is mainly 
> for roads that are known to be flooded frequently. The mapping 
> descriptions include instructions for mapping flood prone waterway 
> crossings, bridges, and highways. However, it is not intended to tag 
> areas, which would be covered by the proposed new tag of hazard=flood 
> for areas tagged as boundary=hazard.

Hello,

flood_prone=yes on areas does actually get a reasonable amount of use:

https://overpass-turbo.eu/s/1w7k

(about 3000 worldwide)

https://wiki.openstreetmap.org/wiki/Tag:boundary%3Dhazard has much less use

https://overpass-turbo.eu/s/1w7l

and seems so far been restricted to "fixed" areas such as (clicking at 
random)

  * A shooting range: https://www.openstreetmap.org/way/1149857565
  * An explosives depot: https://www.openstreetmap.org/way/1166217800

hazard=flooding is used, but mostly on hghways:

https://overpass-turbo.eu/s/1w7m

I'd suggest exploring taginfo (and the overpass links from it) to see 
what keys and values are in use already.  There may well be a use case 
for some new key/value, but I'm not convinced yet.  See e.g. 
https://taginfo.openstreetmap.org/keys/hazard#values and filter the 
various values.

Is "OpenHazardMap" an actual map or just a wiki page?  I ask because I 
live somewhere where river flooding is a thing (although usually of very 
low impact in terms of people or property) and I have created maps of 
"what is currently flooded" based on current measured level and previous 
observations.  See 
https://www.openstreetmap.org/user/SomeoneElse/diary/398374 .

Best Regards,

Andy




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