[Tagging] Mapping leats

[John Sturdy]

In terms of the tags as defined on the wiki, the most relevant bit is
probably: "For a smaller artificial waterways used for irrigation consider
waterway <http://wiki.openstreetmap.org/wiki/Key:waterway>=drain
<http://wiki.openstreetmap.org/wiki/Tag:waterway%3Ddrain> or waterway
<http://wiki.openstreetmap.org/wiki/Key:waterway>=ditch
<http://wiki.openstreetmap.org/wiki/Tag:waterway%3Dditch>." but it's not
for irrigation (spreading water over fields) and neither "drain" nor
"ditch" are words I'd naturally use (as English words) for that --- I'd
call it an irrigation channel.

In terms of its function, a leat is effectively an open-topped pipeline for
water, taking it from one or more water sources to a specific place (such
as a water purification works for a settlement).

__John

On Fri, Apr 21, 2017 at 12:58 PM, Christoph Hormann <osm at imagico.de> wrote:

> On Friday 21 April 2017, Chris Hill wrote:
> > A leat is a very specific thing. It is certainly not a canal, but
> > neither is it a ditch nor drain. I would favour waterway=leat. That
> > describes, unambiguously, exactly what it is.
>
> I guess from your perspective it is but please try to define the meaning
> of waterway=leat for non-native English speakers from a completely
> different part of the world in a way that clearly tells them when to
> use this tag and when to use a different one.
>
> For native English speakers this is often much more difficult - you try
> to synchronize your use of waterway=canal/ditch/drain with your
> understanding of these terms in your language - and inevitably fail
> with that attempt.  I just use these tags as defined on the wiki or as
> they are used by other mappers and don't concern myself with the
> inherent meaning of the value outside OSM.
>
> --
> Christoph Hormann
> http://www.imagico.de/
>
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