[Tagging] key:drinking_water for OSM ways

[Warin]

On 21/2/20 6:16 pm, European Water Project wrote:
> Hi Warin,
>
> contents=water seems more appropriate
That does not stipulate if it is drinking water.
>
> Thanks,
>
> Stuart
>
> On Fri, 21 Feb 2020 at 07:38, Warin <61sundowner at gmail.com 
> <mailto:61sundowner at gmail.com>> wrote:
>
>     So a water tank with drinking water cannot be tagged as drinking
>     water because there is no local access. Fine.
>     Then it is only tagged as a tank with contents=water, or should
>     there be yet another value for it contents=drinking_water?
>     Or a sub tag water=drinking water...
>
>
>     On 21/2/20 5:10 pm, European Water Project wrote:
>>     Hi Martin,
>>
>>     There are a couple of issues I see with drinking_water=yes not
>>     having a concept of access.
>>
>>     1. Where is the observability  ? How can I know if a water tank
>>     has drinking quality water or just agriculture quality water ?
>>     From the wiki :
>>     "One can assume that the water is pure when many people drink it
>>     every day."
>>     This is hard to assume, and one would never know if there is
>>     water ...
>>
>>     2.   But there is an even bigger issue --- and I will admit that
>>     I am biased because of the European Water Project's use case.
>>     For a map feature to be useful, it should have universality. Ie.
>>     if one maps restaurants with toilets, at least customers should
>>     have access ...
>>     Someone who goes to the OSM way where there is a water tank, even
>>     with a wallet full of cash, will die of thirst before getting a
>>     drink.
>>     It's similar to toilet=yes ...   A restaurant with a toilet for
>>     employees only, probably shouldn't have the tag.
>>     Yes, there is an access tag, but in most cases access is implied.
>>
>>     drinking_water = yes, seems to come with access in 99% of the
>>     61,300 nodes and the large majority of the 8,178 ways.
>>
>>     Best regards,
>>
>>     Stuart
>>
>>
>>
>>
>>
>>
>>     On Thu, 20 Feb 2020 at 19:33, Martin Koppenhoefer
>>     <dieterdreist at gmail.com <mailto:dieterdreist at gmail.com>> wrote:
>>
>>         Am Do., 20. Feb. 2020 um 19:14 Uhr schrieb European Water
>>         Project <europeanwaterproject at gmail.com
>>         <mailto:europeanwaterproject at gmail.com>>:
>>
>>             Dear All,
>>
>>             I have noticed that the the key drinking_water = yes for
>>             ways is sometimes used in a manner not described in the wiki.
>>
>>             https://wiki.openstreetmap.org/wiki/Key%3Adrinking_water
>>
>>             The issue has to do with ways which might store drinking
>>             water which is not actually directly accessible.  I think
>>             this tag should be for accessible water.
>>
>>
>>
>>         I don't read from the wiki description that the drinking
>>         water must be directly accessible. It depends on the context
>>         feature.
>>
>>         Cheers
>>         Martin
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