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

Alessandro Sarretta alessandro.sarretta at gmail.com
Sat Aug 31 12:22:57 UTC 2019

Dear Immaculata,

if you want to describe "things" that are prone to floods, it seems to 
me that the tag /flood_prone=yes/ can be the right one.

I have a few doubts on how this information has been collected: are 
there official maps with areas prone to flood and you have selected 
assets in that area or you interviewed people who told you that some 
specific assets were impacted by floods in the past?

If the second is true, verifiability and return times are important 
issues that have to be tackled and somehow mapped.


On 31/08/19 05:21, Immaculate Mwanja wrote:
> Hi there!
> In the summer of 2018, we conducted a project called Assets and 
> Threats mapping 
> <https://docs.google.com/document/d/11HQttl5Pb8IFgATufV4LxaDn0eCXEcEuA56phrf1X0Y/edit#heading=h.gdboihqvh9gy>under 
> the Ramani Huria project in Dar es Salaam, Tanzania that aims to make 
> Dar es Salaam a more flood-resilient city. In this project, we focused 
> on the assets/amenities in the city that are important to the 
> community and are at risk of flooding or not.
> After collecting all the information, we decided we should upload them 
> in OSM to be shared with the world since it was a successful project 
> to some extent. The challenge came when we could not upload these data 
> since there is no specific tag to use for amenities or AoIs affected 
> by floods, the only tag that we could find is flood_prone=yes 
> <https://wiki.openstreetmap.org/wiki/Key:flood_prone>but this is 
> mostly applicable to “roads/ways" that go underwater after heavy rains.
>  1. Is there any other tag that can be used for points under flooding
>     threat or can we use another tag?
>  2. Our initial thought was to create a new tag i.e. asset:risk=yes
>     and asset:risk=noor we could overcome this challenge by having one
>     tag that is used by the entire OSM community to identify ways,
>     areas, or pointsthat are prone to floods
> Kind regards,
> *Immaculata Mwanja*
> _______________________________________________
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> Tagging at openstreetmap.org
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