Hi all, 2018-02-21 17:25 GMT+01:00 Kevin Kenny <[email protected]>:
> 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 François
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