During the RFC of waterways for power generation proposal several discussion raised because of some waterways values. Drain and ditches were ones of them. https://wiki.openstreetmap.org/wiki/Proposed_features/Hydropower_water_supplies
Currently, both canal and drain refer to structure and usage also. Canal is designed for useful water while drain is intended for waste water. usage=* comes to give more information of what canal is intended for. Regarding ditch, it regards both useful and waste water. If we choose to be consistent in waterway=* values, waterway=drain should be abandonned in favor of canal + appropriate usage=* values. Then we'll obtain waterway=canal for artificial waterways whatever their usage and waterway=river, stream and ditch for natural or not-lined watercourses. It's long time changes, see the table here : https://wiki.openstreetmap.org/wiki/Key:waterway#Values All the best François Le ven. 11 janv. 2019 à 20:05, Tod Fitch <[email protected]> a écrit : > Most of what I’d call a drain around here would be large underground pipes > designed to carry storm water. Empty most of the time except perhaps for a > trickle of water from various urban/suburban watering overflow. Used most > of the time by raccoons, possums and rats as away to navigate through or > shelter in an area without having to worry about being attacked by > neighborhood dogs, though the larger ones could be attractive for > adventuresome teenage boys to explore. > > I’d call the open air, usually concrete lined, versions “storm channels” > though that might be a local colloquial. Many/most of those follow > reasonably close to the alignment of the original natural waterways and > often carry the same name as the original (e.g. “Santa Ana River”, “Los > Angele River”, etc.). Again “river” would be a historic term as they are > often dry except during or immediately after a storm. > > Cheers! > > On Jan 11, 2019, at 10:18 AM, Eugene Podshivalov <[email protected]> > wrote: > > Tod, what would be definition of "drain"? > > Eugene > > пт, 11 янв. 2019 г. в 21:10, Tod Fitch <[email protected]>: > >> >> > On Jan 11, 2019, at 8:36 AM, ael <[email protected]> wrote: >> > >> > As a native speaker, I do not recognise "canal" as appropriate for >> > irrigation. That is not to say that some canals may also be used >> > partly for irrigation. >> > >> > But the phrase "irrigation ditch" is common and understood. Bear in >> > mind that the UK is mainly a fairly wet place, so the need for >> > substantial irrigation is not high except in some special cases. The >> > unqualified word "ditch" would normally be understood as an artificial >> > unlined and usually small watercourse. But also, in certain contexts, >> > for a historic trench acting as a defense or fence, not necessarily >> > containing water. >> > >> > That seems to accord with a the sub tag irrigation=yes on ditches - >> > and maybe on other waterways if that is one of the uses/functions. >> > >> > ael >> > >> >> +1 >> >> In the desert where I was raised the cotton fields were surrounded with >> “irrigation ditches”, or “ditches” for short. The fields were watered from >> the ditches by either syphon hoses or sluice gates. >> >> Later, when working on road projects, I found that the low areas on the >> sides of roads (often used as “side borrow” areas during construction of >> the roadway) were formally called “drainage ditches” or just “ditches” for >> short. >> >> So to me a ditch is simply a channel dug to move water. >> >> But I am an American and our terms diverge somewhat from UK usage. So I >> looked it up in my older paper version of the OED to find the first two >> definition are “1. An excavation narrow in proportion to its length; the >> trench or fosse of a fortification, etc.”. “2. Such a hollow dug out to >> receive or conduct water, esp. to carry off the surface drainage of a road >> or field, etc.” >> >> Based on the second, I can see the reason why some would conflate >> “drainage ditch” with simply “ditch”. But I don’t see from this where even >> in UK usage a ditch has to be for drainage. It is simply a long narrow >> excavation and, in the waterway sense, dug to conduct water from one place >> to another. >> >> >> Cheers! >> tf >> >> >> _______________________________________________ >> Tagging mailing list >> [email protected] >> https://lists.openstreetmap.org/listinfo/tagging >> > _______________________________________________ > Tagging mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/tagging > > > _______________________________________________ > Tagging mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/tagging >
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