[Tagging] Drain vs ditch

[Sergio Manzi]

Yes, great descriptions!

My only marginal objection is for canal: why don't you ditch (pun intended...) the "/used to carry useful water for transportation, hydro-power generation, //irrigation or land drainage purposes/" clause?

Are there any other "/Large man-made open flow (free flow vs pipe flow) waterways/" that should *not *be considered canals?

My concern is that somewhere in the world there could be a canal not built for any of those purposes and somebody could object to call it "a canal".

Also isn't "land drainage" potentially in contradiction with "useful water"?

Cheers,

Sergio


On 2019-01-31 23:34, Eugene Podshivalov wrote:
> Hi Markus,
> I find your amendments great.
>
> Cheers,
> Eugene
>
> чт, 31 янв. 2019 г. в 20:29, Markus <selfishseahorse at gmail.com <mailto:selfishseahorse at gmail.com>>:
>
>     Hi Eugene
>
>     Thanks for your summary! [^1] I'm in favour of the proposed
>     definitions and would welcome if the clarifications regarding size you
>     made here [^2] were included in the definitions, like for example
>     (*additions*, ~~deletions~~):
>
>     canal - Large man-made open flow (free flow vs pipe flow) waterways
>     used to carry useful water for transportation, hydro-power generation,
>     irrigation or land drainage purposes. Consider using waterway=ditch
>     for small*er* ~~irrigation or land drainage~~ channels *that directly
>     distribute water to or collect it form the land*. Consider using
>     waterway=drain for small usually lined superflous liquid drainage
>     channels.
>
>     ditch - Small artificial free flow waterways *used to directly
>     distribute water to dry land (for irrigation) or collect water from
>     wet land (for drainage)* ~~used for irrigating dry land or draining
>     wet land~~. Irrigation ditches can be lined or unlined, drainage
>     ditches are usually unlined to let water soak through the land into
>     them. Ditches may have short lined segments at waterway turning points
>     or intersections with roads or paths to prevent erosion. Consider
>     using waterway=canal for large*r* ~~irrigation or land drainage~~
>     channels *that convey water from or to ditches*. Consider using
>     waterway=drain for usually lined superflous liquid drainage channels.
>
>     [^1]: <https://lists.openstreetmap.org/pipermail/tagging/2019-January/042543.html>
>     [^2]: <https://lists.openstreetmap.org/pipermail/tagging/2019-January/042551.html>
>
>     Regards
>
>     Markus
>
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