On Thu, Aug 16, 2018 at 3:02 PM, Andy Townsend <ajt1...@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. -- Paul
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