When drain and ditch were originally introduced, was it supposed to differentiate them in size? If you read the current definitions closely you can notice the following:
https://wiki.openstreetmap.org/wiki/Key:waterway ditch - An *small* artificial free flow waterway used for carrying superfluous water along paths or roads for drainage purposes. https://wiki.openstreetmap.org/wiki/Tag:waterway%3Dditch See also - waterway=drain: *for larger* artificial waterways used for the drainage purposes, and typically lined with concrete or similar Cheers, Eugene чт, 24 янв. 2019 г. в 14:57, Peter Elderson <[email protected]>: > Same here. Drains we don't have that much (almost none), but many many > ditches of all sizes ('sloot') and canals of all sizes ('vaart', 'gracht', > 'singel'). > They carry and store water to and from the land: the whole system is > designed to keep ground water levels fixed in dry times as well as wet > times, no matter how extreme. So the flow direction is not fixed and the > waterways are used for land drainage, irrigation, fire brigades, drinking > water for cattle, boats and canoes, dumping bodies, murder weapons and > broken bikes, and at times, ice skating. No single dedicated use. > The consequence of mapping all ditches as ways is that in z19 on OSM carto > the land look almost water-less, while in z14 the amount of water looks > much higher than it actually is. > > > > Vr gr Peter Elderson > > > Op do 24 jan. 2019 om 12:24 schreef Eugene Podshivalov <[email protected] > >: > >> The question that still remains is: what does "small" and "large" mean? >> >> I daresay there is no way and no need to clarify the meanings of "small" >> and "large" for artificial waterways. We can leave this up to the user to >> decide on it. >> Even the definition of a steam as "you can jump over it" is not really >> observed. You can jump over a 1-1.5 meter waterway but people are tagging 3 >> meter wide waterways as steams as well because otherwise there would be a >> big difference between the stream 1-1.5 and river 1.5-10 meter width ranges >> (waterways greater than 10m can already be mapped with waterbodies, so I >> don't mention them there). >> >> In the place where I live drainage ditches and drains can be from 0.1 to >> 5 meters wide, and anything greater then that can be called a canal. >> >> Cheers, >> Eugene >> >> вс, 20 янв. 2019 г. в 01:22, Markus <[email protected]>: >> >>> On Wed, 16 Jan 2019 at 13:40, Eugene Podshivalov <[email protected]> >>> wrote: >>> > >>> > ditch - Small artificial free flow waterways used for irrigating or >>> draining land as well as for deviding land. Irrigation ditches can be lined >>> or unlined, drainage ditches are usually unlined. Consider using >>> waterway=canal for large irrigation or land drainage channels. Consider >>> using waterway=drain for lined superflous liquid drainage channels. >>> >>> I would even go one step further and abandon waterway=drain. >>> >>> The question that still remains is: what does "small" and "large" mean? >>> >>> Regards >>> >>> Markus >>> >>> _______________________________________________ >>> 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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