[Tagging] How to tag small canals?

Paul Allen pla16021 at gmail.com
Thu Aug 16 14:55:11 UTC 2018

On Thu, Aug 16, 2018 at 3:02 PM, Andy Townsend <ajt1047 at gmail.com> wrote:

> On 16/08/2018 08:49, SelfishSeahorse wrote:

> It seems to me that waterway=ditch +
>> usage=headrace/tailrace/irrigation fits best, but the wiki defines
>> waterway=ditch as 'a small man-made draining waterway, often found
>> along roads'.
> Personally I'd probably use "drain" for those two, and "ditch" maybe for
> some smaller ones.

I used waterway=canal + usage=headrace for the flow to a water mill.  I'm
not entirely sure that is correct because
the wiki seems to be defining headrace in terms of water flowing through a
tunnel (to electrical turbines or similar)
without a thought for other usage.

There's a problem with it.  It renders ridiculously wide (on the standard
map) at low zooms, ending up as large as the
mill pond.  I tried limiting it with the width tag, which appeared to be
ignored on the standard map.  I then tried using
natural=water + water=canal on an area to limit the width that way, but to
no effect.  At high zooms it's correct, at lower
zooms it is rendered far wider than it should be.

See https://www.openstreetmap.org/#map=19/52.08104/-4.67894  And yes, "Mill
Race" and "Mill Pond" look like
descriptions.  They also happen to be the names used to refer to those
features.  The mill itself is called "Y Felin."
Which is Welsh for "The Mill."  Often the name of a thing is also a
description because, over time, the description
becomes the name.

And, yes, I have been unable to determine the route of the water after the
tailrace.  Maybe there's a teleporter
below the wheel.

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