[Tagging] waterway=penstock to complete pipeline tagging

Bryce Nesbitt bryce2 at obviously.com
Fri Oct 9 14:28:48 UTC 2015

On Mon, Oct 5, 2015 at 4:41 AM, Fran├žois Lacombe <fl.infosreseaux at gmail.com>
> Currently, I find something missing regarding man_made=pipeline +
> substance=water because a pipe carrying water can correspond to many
> things in reality.
> man_made=pipeline + substance=water + *waterway=penstock* would fill the
> lack.

The problem with man_made + waterway on the same node, is both are top
level tags.
Here you'd want a refinement tag for pipeline.


There are two valid but separate goals to keep in mind.  Are you mapping
* Visible surface features
* The flow of material

Both are valid mapping goals.  For mapping the flow you want a continuous
link of
tags that imply water flow.  That penstock comes from a reservoir or weir,
passes through a generating station, and exits into a canal which dumps
into a river
or a sink.  That flow could be one way or in the case of storage reservoirs
two ways (pumped
uphill at low demand times).

Equally valid is mapping the surface expression only.  Those are pipes
sticking up out of the ground (a man made feature).
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