On 23.02.2019 00:09, Graeme Fitzpatrick wrote:
> [...]
> =drain: Use waterway=drain for artificial waterways, typically lined
with concrete or similar, usually used to carry water for drainage or
irrigation purposes.
> [...]
Irrigate with drains? This was the original question of the whole ditch
vs. drain discussion (see
(https://lists.openstreetmap.org/pipermail/tagging/2019-January/042047.html).
It seems to be a contradiction to what wikipedia explains (and therefore
is difficult to remember):
https://en.wikipedia.org/wiki/Drainage: "Drainage is the natural or
artificial removal of a surface's water and sub-surface water from an
area with excess of water..."
https://en.wikipedia.org/wiki/Ditch: "A ditch is a small to moderate
depression created to channel water. A ditch can be used for drainage,
to drain water from low-lying areas, alongside roadways or fields, or to
channel water from a more distant source for plant irrigation..."
And we already have irrigation mentioned on the OSM wiki page for ditch
and not on the OSM wiki page for drain. I think these current
definitions should be changed as little as possible.
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