[Tagging] Proposed features - RFC 2 - Pressurized waterways

[François Lacombe]

Hi

2018-02-15 3:47 GMT+01:00 Warin <61sundowner at gmail.com>:

> Are all of these these proposed waterway=pressurised in pipes?
>

No, there are 3 big categories : in pipeline, in tunnel, in caves.


>
> You can gather I find the proposal confusing...
>
> Talk of canals  and .. they are not part of this?
>

I know it's a bit technical, that's why I made charts to illustrate the
document
https://wiki.openstreetmap.org/wiki/File:Waterway_manmade_structures.png

Canals are part of this : https://wiki.openstreetmap.
org/wiki/Proposed_features/Hydropower_water_supplies#Overground_canals

2018-02-15 9:46 GMT+01:00 Martin Koppenhoefer <dieterdreist at gmail.com>:
>for the pipeline there are tags, so we need them for waterways through
cavities?
Yes, ideally the same than on pipelines.

> waterway=stream/river + tunnel=siphon for natural pressurized waterways
in a siphon. You could add pressurized=*, but I'd see this implied by the
term siphon
> waterway=river tunnel=pipe pressurized=yes for man made pressurized
passages  (maybe the pipe also already implies pressurized).
Related to this discussion : https://wiki.openstreetmap.
org/wiki/Talk:Proposed_features/Hydropower_water_
supplies#Bad_use_of_waterway_key
We should not mix free flow and pipe flow waterways, and
waterway=stream/river are currently used on open air free flow features.

Issue with tunnel=pipe is that it looks like merging tunnel and pipeline
which are set incompatible unless the pipeline is inside a proper tunnel.

I made this table to summarize how existing values and proposed pressurised
organize in waterway key
https://wiki.openstreetmap.org/wiki/Proposed_features/Hydropower_water_supplies#Pressurised_waterway_.28pipe_flow_only.29
As to get a complete waterway topology, the table have to be completely
filled.

We can differentiate natural and man made pipe flow values, currently
pressurised is proposed for both.

All the best

François
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