Hi all, Regarding thsi proposal, I've moved waterway=duct to waterway=pressurized. It covers many kind of situations, from natural siphons to man made penstocks. While a penstock is always a (man made) pipeline, a natural siphon isn't. Finally we may get more correct use of pipeline and canals which are currently overused for underground and pipe flow facilities. https://wiki.openstreetmap.org/wiki/Proposed_features/Hydropower_water_supplies
It introduces this new value beside all existing open flow values (river, stream, canal...). Feel free to complete comments, all the best François 2017-12-07 11:06 GMT+01:00 François Lacombe <[email protected]>: > Hi, > > 2017-12-07 2:42 GMT+01:00 Andrew Davidson <[email protected]>: > >> 1. waterway is the wrong key. Waterways are for open-channel features. >> There is already a man_made=pipeline for pipe flow. I'm not sure why we >> need a different tag for this. >> > Can you link me where waterway is explicitly described for open-channel > ways only please ? > > man_made=pipeline is not a water specific key and It's a great benefit to > get raw water hydrographic graph by looking at waterway=* only. > Like highway=* is not specific to open air roads but for bridges and > tunnels too, I don't see any objection to involve tubes and pressure pipes > into waterway, with a new dedicated value as to not break things regarding > existing consumers. > > > >> 2. duct is the wrong value. Ducts refers to low pressure pipes carrying >> gases. >> > > I agree it's not perfect > > How can I refine it ? > It is intended for pipe flow waterways > > I really have difficulties to understand a tunnel without tube carrying > pipe flow water as man_made=pipeline > Then waterway=pipeline sounds more restrictive than its actual target. > > François > >
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