The confusion is mainly in the difference between irrigation canals vs irrigation ditches and drainage diches vs drains.
In practice wide irrigation channels are called canals whereas small ones are called diches and people tend to tag them as such. This tendency is enforced by the fact that canals and diches are rendered in difference size. IMO there is no problem here, we should just document this usage properly. Drainage diches and drains are confused simply because of their identical definition on the waterway wiki page https://wiki.openstreetmap.org/wiki/Key:waterway drain - An artificial free flow waterway used for carrying superfluous water like storm water... ditch - An small artificial free flow waterway used for carrying superfluous water along paths or roads for drainage purposes If I did not read their proper wiki pages I would think that they differ only in size with ditches being smaller than drains. A tricky thing is that both drains and drainage ditches are used alog paths or roads but we call it a drain only when it is part of a system of collecting and disposing of rain water in an urban area as described at https://en.wikipedia.org/wiki/Storm_drain So again we just need to properly document the meanings of these tags. Eugene сб, 12 янв. 2019 г. в 19:40, Markus <[email protected]>: > On Fri, 11 Jan 2019 at 21:03, François Lacombe > <[email protected]> wrote: > > > > Regarding ditch, it regards both useful and waste water. > > While true in English usage, waterway=drain apparently was intended > for artificial waterways removing undesirable water: > > https://lists.openstreetmap.org/pipermail/tagging/2018-August/038505.html > > See here for the whole discussion about 'How to tag small canals?' > from August 2018: > > > https://lists.openstreetmap.org/pipermail/tagging/2018-August/thread.html#38452 > > If you want to extend the meaning of waterway=drain to also include > artificial waterways, how do you intend to differentiate them from > waterway=canal? > > Regards > > Markus > > _______________________________________________ > Tagging mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/tagging >
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