Whilst it is a great idea to capture local knowledge about flooding, especially where it is currently not available, I am concerned that this doesn't have on-the-ground verification.
Flood risk areas are predictions generated via modelling software and it depends on which software you use, and the quality of the input data. The current hazardous areas get away with it by mapping areas marked out by signage. Sure, the signs may have been placed following predictions, but they are physically there to be seen. On Thu, 15 Jun 2023, 18:25 Andy Townsend, <ajt1...@gmail.com> wrote: > 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 > > > > > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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