Since Roman times, the major flow coming from the South slowly & naturally took a shift to the left away from the channel via Leiden and towards Rotterdam. Over time more & more water coming from the German Rhine took this new route to the sea. It's no wonder that locals insisted their local, mostly unchanged river keep the same name. And so it came to be that that water from the Alps travels 1000km in a river called the #Rhine, but spends the last 100km in the #Waal and #Scheur & #Haringvliet.