[Tagging] How to tag flood prone points and areas?

[Warin]

On 1/9/19 10:30 am, Graeme Fitzpatrick wrote:
>
>
> On Sat, 31 Aug 2019 at 20:51, Paul Allen <pla16021 at gmail.com 
> <mailto:pla16021 at gmail.com>> wrote:
>
>     Verifiability is a problem.
>
>
> Near here, there's one office building built lake-side, that has a car 
> park as the ground level of the building. The car park has a line 
> painted round it, about half way up the wall (1.2 - 1.5 m's) labelled 
> as the 1-100 year flood level.
>
> Another river side shopping centre has signs down the river end of the 
> car park, warning that that part of the park floods during heavy rain.
>
> The first one is only a potential, so you wouldn't map that as flood 
> prone, but you would the second, but how?
>
> You could add flood_prone=yes to the car park tag but that will show 
> the whole car park as affected, whereas it's only the bit down this 
> end that has a problem. Would drawing a separate area & marking that 
> as flood_prone=yes work?
>

I asked this question some time ago. I was told it was not verifiable 
and therefore not for OSM.


My opinion remains - it can be mapped.


However there is the question of frequency, once in 10 year event, once 
in 100 etc. So I would add a sub tag or value about frequency of the 
event.. The key frequency is already in use. Period has some use too, 
though the use looks to be years.. no wiki to say what it is?

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