Hi Illia, Thank you very much for sharing the link. I have had a look at it before but since the description focused on flooded roads and road signs and not area hazards I didn`t go further with it. However, I can see now how having two too similar tags on flooding could be confusing. I would therefore like to suggest to adapct and extent the current description and wiki page of Tag:hazard=flooding (https://wiki.openstreetmap.org/wiki/Tag:hazard=flooding) to following:
*Tag: hazard=flooded* Description: A location that is prone to flooding. This tag is used to indicate areas or features (roads, points of interest, etc.) that are frequently or temporarily affected by floods, presenting a hazard to navigation or safety. Usage: - *For Roads and Road Signs*: The hazard=flooded tag can be applied to roads and road signs to indicate that the road is prone to flooding. It helps raise awareness among users and can aid in route planning during periods of heavy rain or flood events. - *For Area Hazards*: The hazard=flooded tag can also be used to identify areas that are prone to flooding, such as floodplains. This usage helps to highlight the potential hazard in a broader context and capture community knowledge of local flood conditions. - *In Combination with **boundary=hazard*: Ideally the hazard=flooded tag is used in combination with the boundary=hazard tag, it denotes a defined boundary or area where the hazard of flooding exists. This combination can be applied to mark specific regions, neighborhoods, or zones that are at risk of flooding. It provides a more precise representation of the affected area. Please note that the hazard=flooded tag should only be applied to areas or features that are susceptible to flooding. It is essential to rely on accurate and up-to-date information to ensure the tag's correct application. What do you think? All the best, Cornelia On Tue, Jun 20, 2023 at 2:11 AM Illia Marchenko <illiamarchenk...@gmail.com> wrote: > Just see wiki.openstreetmap.org/wiki/Tag:hazard=flooding > > Regards, > Illia. > > Cornelia Scholz via Tagging <tagging@openstreetmap.org>: > >> Hi all, >> >> Many thanks for the responses and feedback! :) Here a few comments: >> >> - The aim would be to collect information on historic floods and >> community knowledge of hazard exposure. I work for the Red Cross Climate >> Centre on hazard assessments in typically data scarce areas (e.g. East >> Sudan). While in many western countries most flood areas have high-quality >> flood maps derived from scientific flood models, in those areas we lack >> this information. There are of course global flood models, but they lack >> verification and validation on a local level in many areas I am looking >> into. Especially there, being able to capture information of historic, true >> flood extents and community knowledge is crucial to fill those data gaps >> and improve disaster risk reduction efforts. >> - I reviewed existing tags and tag info, but I thought it lacked some >> uniformity. While with boundary=hazard and the added value there already >> exist approved natural hazard tags which I find make more sense to add in >> here. >> - The OpenHazrdMap was set up as Wiki Page but wasn`t followed through >> and no voting or approval for suggested tags was carried out. >> >> Please let me know what you think, and whether you would approve to >> adding the flood value 'flood' as value to the key 'hazard' (to be used in >> combination with the tag boundary=hazard). >> >> All the best and many thanks, >> Cornelia >> >> >> On Fri, Jun 16, 2023 at 9:13 AM Jez Nicholson <jez.nichol...@gmail.com> >> wrote: >> >>> Noted. >>> >>> >>> I was [over]reacting to the section from OP about return periods. >>> >>> If this proposal is specifically about areas of historical flooding >>> rather than areas deemed at risk of flooding then they *can* be observed >>> on-the-ground. >>> >>> On Fri, 16 Jun 2023, 01:08 Andy Townsend, <ajt1...@gmail.com> wrote: >>> >>>> On 15/06/2023 20:47, Jez Nicholson wrote: >>>> >>>> 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. >>>> >>>> I don't think that anyone has suggested that - at least not in this >>>> thread? >>>> >>>> The original email said "The location and extent of these hazard areas >>>> is often well known by local communities with knowledge of past events." >>>> >>>> When I talked about "what is currently flooded based on current >>>> measured level and previous observations" I meant exactly that - >>>> recording that when a river level at a known point reads X, land at Y (in >>>> the vicinity of X) will also be flooded. >>>> >>>> >>>> Flood risk areas are predictions generated via modelling software and >>>> it depends on which software you use, and the quality of the input data. >>>> >>>> Indeed - the Environment Agency in the UK (and other agencies >>>> elsewhere) make extensive use of this sort of model, but I suspect that >>>> mapping this sort of thing goes bit beyond what can usefully done within >>>> OSM, though of course it can be combined with OSM data by a data consumer >>>> to create "risk maps". >>>> >>>> >>>> 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. >>>> >>>> I suspect that this isn't true for all "boundary=hazard" in OSM at the >>>> moment (picking one at random, the signage for >>>> https://www.openstreetmap.org/way/500428513 and the wider >>>> https://www.openstreetmap.org/relation/15680620 doesn't look >>>> especially extensive - see >>>> https://www.abc.net.au/radio/programs/australia-wide/australia-wide/13490888#:~:text=Wittenoom%20is%20the%20largest%20contaminated,site%20in%20Western%20Australia%27s%20Pilbara. >>>> ) >>>> >>>> Best Regards, >>>> >>>> Andy >>>> _______________________________________________ >>>> Tagging mailing list >>>> Tagging@openstreetmap.org >>>> https://lists.openstreetmap.org/listinfo/tagging >>>> >>> _______________________________________________ >>> Tagging mailing list >>> Tagging@openstreetmap.org >>> https://lists.openstreetmap.org/listinfo/tagging >>> >> _______________________________________________ >> Tagging mailing list >> Tagging@openstreetmap.org >> https://lists.openstreetmap.org/listinfo/tagging >> > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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