On Fri, 22 Feb 2019 at 20:48, Eugene Podshivalov <yauge...@gmail.com> wrote:
> The primary concern of mine about the current definitios of drain and > ditch is that some people are differentiating them by size. > > or stay close to dictionary definitions which assumes some overlapping > between the meanings. Here is an example: > drain - a narrow artificial open-air channel that takes away waste liquids > or rainwater > ditch - a narrow channel dug at the side of a road or field to hold, bring > or carry away water > I'd agree that you can't differentiate between drain & ditch based on size (except they're both smaller / narrower than a canal), but you also can't pick them based on locations - either of them can run alongside a road, or go across a field I'd suggest we just stick with the simple definitions based on lined / unlined that I thought we all sort of agreed on, way back up there ^ :-) =canal: Use waterway <https://wiki.openstreetmap.org/wiki/Key:waterway>= canal for large man-made *open flow* (free flow vs pipe flow) waterways <https://wiki.openstreetmap.org/wiki/Waterways> used to carry useful water, usually for transportation, but also for hydro-power generation or irrigation purposes =drain: 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: Use waterway <https://wiki.openstreetmap.org/wiki/Key:waterway>= ditch for artificial waterways <https://wiki.openstreetmap.org/wiki/Waterways>, typically unlined, usually used to remove storm-water or similar from nearby land. 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. Thanks Graeme
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