> > =drain > suggested: Use waterway <https://wiki.openstreetmap.org/wiki/Key:waterway> > =drain for artificial waterways > <https://wiki.openstreetmap.org/wiki/Waterways>, typically lined with > concrete or similar, usually used to carry water for drainage or > irrigation purposes. > > =ditch > suggested: Use waterway <https://wiki.openstreetmap.org/wiki/Key:waterway> > =ditch for simple narrow artificial waterways > <https://wiki.openstreetmap.org/wiki/Waterways>, typically unlined, > usually used to remove storm-water or similar from nearby land. Ditches > are usually straight (as opposed to natural streams). They may contain > little water or even be dry most of the year – to mark this intermittent > <https://wiki.openstreetmap.org/wiki/Key:intermittent>=yes may be used. >
I don't know if that was done on purpose of by mistake but these definitions are mixed up a bit. It is ditches that are used for irrigation, not drains. I would suggest to define them 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 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. consider using waterway=ditch for unlined channels used to drain nearby land. consider using waterway=canal for large unlined land drainage channels. ditch - small artificial free flow unlined waterways used for irrigating or draining land as well as for deviding land. consider using waterway=canal for large irrigation or land drainage channels. consider using waterway=drain for lined superflous liquid drainage channels. No need to introduce any new tags. Eugene ср, 16 янв. 2019 г. в 05:12, Warin <61sundow...@gmail.com>: > On 16/01/19 11:53, Graeme Fitzpatrick wrote: > > > On Wed, 16 Jan 2019 at 10:28, Dave Swarthout <daveswarth...@gmail.com> > wrote: > >> >> Although the 1st definition sort of agrees with your usage, the common >> definition in the U.S. is closer to the other two. There are several other >> definitions given but most of them are similar to those two. So it will be >> a bit confusing to use here in the U.S. >> > > Now why does that amaze me! :-) > > irrigation channel: a passage > <https://www.macmillandictionary.com/dictionary/british/passage> dug > <https://www.macmillandictionary.com/dictionary/british/dug> in the ground > <https://www.macmillandictionary.com/dictionary/british/ground_1> and used > <https://www.macmillandictionary.com/dictionary/british/used> for bringing > <https://www.macmillandictionary.com/dictionary/british/bring> water > <https://www.macmillandictionary.com/dictionary/british/water_1> to land > <https://www.macmillandictionary.com/dictionary/british/land_1> in order > <https://www.macmillandictionary.com/dictionary/british/order_1> to make > <https://www.macmillandictionary.com/dictionary/british/make_1> plants > <https://www.macmillandictionary.com/dictionary/british/plant_1> grow > <https://www.macmillandictionary.com/dictionary/british/grow> > > > > OSM gives a distinction between river and stream. > There should be a similar distinction between 'drain' etc. > It should not be base on the flow of water as that could be hard to > determine - especially if the water is off when mapping. > > For example, 'a drain can be easily stepped over'? > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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