Hi 2018-02-15 3:47 GMT+01:00 Warin <61sundow...@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 <dieterdre...@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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