[Tagging] Drain vs ditch

Markus selfishseahorse at gmail.com
Thu Jan 31 17:27:36 UTC 2019

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

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>



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