Hi Paul, 2018-02-12 17:12 GMT+01:00 Paul Allen <pla16...@gmail.com>:
> Does that help or make matters worse? > Thank you for your contribution. Given problem is cluttering waterway=* key a bit more with additional values may not be accepted. According to comments, I should use established values and the only one added is waterway=pressurised. waterway=canal is currently used to map non navigable waterways and it's the closest thing corresponding to carry useful water. canal=* or tunnel=* are intended to give canal usage I agree there are aqueducts, but it's a concept composed of canals, pipes, tunnels depending of environment don't you ? 2018-02-12 19:14 GMT+01:00 Volker Schmidt <vosc...@gmail.com>: >There is another type of a combination of open waterway, underground waterway, and pressurised waterway/pipeline: >a siphon (see [1]). This is a frequent situation here in northern Italy. They came in all sizes, and there are hundreds of them around here. This is a great add, thank you :) I would map this as waterway=pressurised + tunnel=transmission, if and ONLY if intakes are always below the water level. On your picture (http://www.acquerisorgive.it/wp-content/uploads/2014/01/ IMG_0121.jpg), I can barely see the top of the tunnel and air could get inside, couldn't you ? Then, waterway=canal + tunnel=transmission + location=underground would be enough if intakes are above water level. Do you have more precise pictures that would be added to examples sections ? All the best François
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