On 24 July 2018 at 18:49, François Lacombe <fl.infosrese...@gmail.com> wrote:
> > No because water always flows, look at the left picture on the danger sign. > Sorry, couldn't see the water - just looked like a dry gully It's just that sometimes, hydroelectric operator releases big amount of > water wich completely and quickly flood the river bed. > We have similar situations near here, not so much for hydro plants, but where roads will be cut if the upstream dam spillway is opened. One example is: https://www.google.com/maps/@-27.4429915,152.6679699,3a,75y,35.71h,84.39t/data=!3m6!1e1!3m4!1sFjJWiXyzTOGjLkKotkCgkw!2e0!7i13312!8i6656, which we only show as a bridge across the River https://www.openstreetmap.org/#map=16/-27.4427/152.6735 > flood_prone could be a solution, but it's currently intended for monsoon > or snow melt moments, not for few hours or minutes of human controlled > flooding. > That's certainly the way that the "varying water level" page is written, but the flood_prone key https://wiki.openstreetmap.org/wiki/Key:flood_prone says " A way or an area that is prone to flooding". Yes, it goes on to also say mostly after heavy rain, but I don't think it precludes any form of flooding / inundation? Do we have any way of tagging the rate at which the water level rises eg 1m in 10 minutes? That may be another way of pointing out that this is a dangerous area. Graeme
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