Sounds good, Eugene. I like those descriptions. On Wed, Jan 16, 2019 at 4:41 PM Eugene Podshivalov <yauge...@gmail.com> wrote:
> =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 >> > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging > -- Dave Swarthout Homer, Alaska Chiang Mai, Thailand Travel Blog at http://dswarthout.blogspot.com
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