On Fri, Sep 27, 2013 at 1:00 PM, John Sturdy <jcg.stu...@gmail.com> wrote:
>> Also, wouldn't we be able to use waterway=canal, tunnel=yes (or whatever tag >> we use for underground waterways)? Possibly combined with qanat=yes? > > Or perhaps waterway=canal, tunnel=yes, canal=qanat? This makes sense. It also leaves possibility for mapping open qanats, which go on the surface. This happens sometimes in the end sections, before the water gets divided among recipients. > Or man_made=pipeline, location=underground, type=water? > > I think I'd call it a pipeline if the water fills it to the roof of > the tunnel, and a canal if there's air above the water (which seems to > be the case, as Wikipedia mentions air from the tunnels being used for > cooling). Qanats are not pipelines, there's usually plenty of space above the water. Some of them would collapse when filled, as the upper part is not protected against water. > If anyone's going to map to that level of detail, will "depth" refer > to the draught of the water channel (depth from bottom to top of the > water), or depth of the whole thing below the ground surface? I think it should mean the depth of the bottom of the qanat relative to the ground surface. The depth of water is variable with seasons and of less importance. How do we map the shafts then? It is similar to manhole=* in some way, but also serves for ventilation purposes. -- Michał _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
