On 28/08/2014 19:49, Peter Barth wrote:
A more detailed description can also be found on my user diary here: http://www.openstreetmap.org/user/Peda/diary/23632
Your statement that canals may flow uphill is incorrect. Where canals pass over a summit, the water supply is fed into the topmost pound and then flows in both directions (i.e. downhill) from that feed. Therefore the water flow should always match a topological analysis. In the case of contour canals, no actual water flow may take place, therefore the direction of the way would be arbitrary.
Also, for navigational reasons, canal administrations [in Europe (CEVNI)] have to define a left & right bank to determine the colours of buoys & nomenclature of signage. These may conflict with the actual water flow, since the left/right choice is arbitrary. Likewise the direction of the way.
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