[Tagging] Proposed features - RFC 2 - Pressurized waterways

Fran├žois Lacombe fl.infosreseaux at gmail.com
Tue Feb 27 23:41:58 UTC 2018


Hi all,

2018-02-21 17:25 GMT+01:00 Kevin Kenny <kevin.b.kenny+osm at gmail.com>:

> I think you're right. The Aqua Marcia, Aqua Ano Vetus, Aqua Anio
> Novus, and Aqua Claudia were all known as 'aqueducts' and were systems
> that were tens of km, in canals where possible, but mostly in
> underground conduits. There were pressurized syphons for valley
> crossings. Only the terminal portions of the aqueducts, as they
> approached the City, or crossings of deep valleys, were on arcades -
> but these make the tourist pictures, so people get the incorrect
> impression that 'aqueduct' is synonymous with 'arcade'.
>

This sounds to be an enough justification to don't use the aqueduct term,
thank you Kevin

The proposal is for now in its final version, with various key points :
- waterway=pressurised to make a continuation of rivers in pipelines,
tunnels and natural caves
- tunnel=flooded to make a distinguish between human accessible and flooded
tunnels in operation
- A more wide tagging with usage=* for tunnels, canals, bridges as to take
advantage of pipelines/railway tagging
- No more cluttering of waterway key with spillways (moved to usage=*)
according to comments

The table in this chapter summarize the need of a waterway value, among
other schematics and pictures
https://wiki.openstreetmap.org/wiki/Proposed_features/Hydropower_water_supplies#Pressurised_waterway_.28pipe_flow_only.29

No better terminology than pressurised has risen so far
Aqueduct is not properly a building but a system, Canal have to stay
dedicated to free flow streams outside and inside tunnels
River, Stream can't be used in man made structures since they are currently
dedicated to natural flows.

Without further comments a second vote can begin shortly, stay tuned :)

All the best

Fran├žois
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