@vicgrinberg I was chatting with a good friend who lives in Catalonia about this earlier today, and he mentioned that the river there was diverted south some years back, and then the former course / floodplain extensively developed (roads, houses etc.). He said even at that time there were people saying it was a mistake, and that while this recent rainfall in the mountains was unprecedented, it was probably just a matter of time before something like this was going to happen.