[Tagging] waterway=penstock to complete pipeline tagging

[Colin Smale]

Why can a drilled rock tunnel, or an aqueduct for that matter, not be
part of a pipeline? Are you just saying it is unlikely, or do you mean
that it would no longer be called a pipeline if part of its distance is
drilled through rock instead of being a steel pipe? According to this
article that is possible: 

http://www.muehlhan.com/index.php/en/markets-and-references/bridges-pipelines/penstock


"Penstock" indicates the function, not a means of construction. 

I think the sentence "Modern aqueducts may also use pipelines" might be
better rephrased as "Modern aqueducts may carry the (water) in pipes
instead of the traditional open channels." 

--colin 

On 2015-10-09 18:27, François Lacombe wrote: 

> According to this wikipedia article : NYC Water supply
> https://en.wikipedia.org/wiki/New_York_City_water_supply_system
> 
> I see many terms to talk about Catskill Aqueduct which is a major part
> of this system : aquduct, conduit, tunnel, siphon... but pipeline is
> never used.
> Google tells nothing about Catskill pipeline but has many results
> regarding Catskill aqueduct.
> 
> Again here : https://en.wikipedia.org/wiki/Aqueduct_%28water_supply%29
> I think the sentence "Modern aqueducts may also use pipelines", which
> sounds like "An aqueduct is not always a pipeline".
> 
> I agree with Colin : a pipeline is a route, but won't be composed of
> bare rock drilled tunnels.
> 
> The waterway=penstock should exist on the wiki to summarize all this
> interesting discussion.
> 
> All the best
> François Lacombe
> 
> fl dot infosreseaux At gmail dot com
> www.infos-reseaux.com [1]
> @InfosReseaux
> 
> 2015-10-09 17:40 GMT+02:00 Colin Smale <colin.smale at xs4all.nl>: 
> 
>> I see a pipeline as analogous to a route, i.e. from one place to another,
>> made up of many contiguous segments of varying types. Many of these segments
>> may be (steel) pipes, but they may also be drilled through rock or whatever.
>> A penstock is a particular function of certain pipelines, for example from
>> high up to the turbine hall. This pipeline can be made of all kinds of
>> segments, just like all other pipelines.
>> 
>> //colin
>> 
>> On 2015-10-09 16:59, François Lacombe wrote:
>> 
>> Hi everyone,
>> 
>> 2015-10-07 1:02 GMT+02:00 Warin <61sundowner at gmail.com>:
>> 
>> I'd like to think anything carrying waste water (sewer) would have a non
>> permeable lining.. and that lining could be called a 'pipe' and thus it is a
>> 'pipeline'.
>> 
>> To me the 'tubes' in my house for carrying water/gas are pipes .. and as
>> they are a line then they are pipelines!
>> 
>> I'd like to consider the pipeline is almost replacable by its operator.
>> A tunnel, furthermore when it's shielded, carrying water isn't
>> replacable at all and its components aren't pipes at all.
>> 
>> Digging rock to get a tunnel is a lot heavier than installing a
>> pipeline. It doesn't have the same environmental footprint too.
>> 
>> Ok to say that sewerage facilities are almost pipelines, but
>> sometimes, they are drains or tunnel.
>> 
>> 2015-10-09 16:28 GMT+02:00 Bryce Nesbitt <bryce2 at obviously.com>:
>> 
>> 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.
>> 
>> I prefer to say that both man_made=pipeline and waterway=* can be
>> standalone to have a meaning instead of the "top level" expression.
>> 
>> The extension I propose (I'm not refining any existing values here)
>> isn't only focused on pipeline but on tunnels too.
>> Due to the reasons we talked this week it shouldn't only concern pipelines.
>> 
>> --
>> 
>> There are two valid but separate goals to keep in mind.  Are you mapping
>> the:
>> * 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).
>> 
>> I would like to map the visible surface features : man_made=pipeline
>> ONLY when the penstock is visible and composed of pipes
>> AND I would like to map the flow of material with waterway=penstock at
>> the same time.
>> 
>> A penstock may be a pipeline but water is always flowing inside isn't it ?
>> 
>> Cheers
>> 
>> François Lacombe
>> 
>> fl dot infosreseaux At gmail dot com
>> www.infos-reseaux.com [1]
>> @InfosReseaux
>> 
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