[Tagging] Drain vs ditch

[Graeme Fitzpatrick]

On Fri, 22 Feb 2019 at 20:48, Eugene Podshivalov <yaugenka at 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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