Here is a summary of the discussion to check if there is a consensus. Current definitions of artificial waterways are unclear and ambiguous. Some people assume that ditch and drain differ mainly in size, others differentiate them mainly on liquid type (can or cannot carry industrial discharge), others rely on lined or unlined characteristic.
It is suggested to resolve the ambiguities by updating the definitions as follows. 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 irrigation or land drainage channels. Consider using waterway=drain for small usually lined superflous liquid drainage channels. drain - Small artificial free flow waterways usually lined with concrete or similar used for carrying away superflous liquid like rain water or industrial discharge without letting it soak into the ground. Consider using waterway=ditch for unlined channels used to drain nearby wet land. Consider using waterway=canal for large unlined land drainage channels. ditch - Small artificial free flow waterways 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 irrigation or land drainage channels. Consider using waterway=drain for usually lined superflous liquid drainage channels. Cheers, Eugene вт, 29 янв. 2019 г. в 18:32, marc marc <marc_marc_...@hotmail.com>: > Le 29.01.19 à 16:13, Eugene Podshivalov a écrit : > > How to we proceed with this topic? Should a proposal be created or the > > wiki pages can be updated straight away by someone or myself based on > > this discussion? > > maybe it's a good idea to write a small-summary-only post > to check if there is a consensus on this, because there are probably > many participants who have dropped out given the number of emails that > the subject has generated > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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