"<a href=""https://www.youtube.com/watch?v=b6utGZQ9Sks&amp;t=0m12s"">0:12</a> If they've no power on them what's driving the propeller that's disturbing the water behind this one ?",(reply>), @Genius at Work The height of the water is of no significance in its own right. It is merely an indication of relative flow - which could spin a vessel very easily. And vessels generally do not have powerful controls (big enough rudder or thrusters) to keep a vessel under planned control. It's a dangerous matter of working with nature in successfully navigating such conditions and knowing how your vessel is going to be affected.<br>But then, you probably know all this already :),(reply>), @pmailkeey The Rhine Bend in Basel can be massively turbulent, especially when there is a lot of Water like right now. The Navigators of the large Freight Ships actually need a special License to manouver though it or have to take a Pilot; it's a very tight Corner with strong Current, causing the Water to be up to 1 m higher on the outer (left/south-west) Bank than on the inner one. Plus there are five Bridges in it to possibly crash into.,(reply>), @Genius at Work Actually, looking at it again, the water in the foreground is fairly turbulent - so it's likely a continuation of that. Oddly rudders don't generally initiate turbulence - they'll deflect it from a prop - or, perhaps in this case, from preexisting turbulence.,(reply>), That Wake is caused by the Rudder,(reply>), Just eddies from the boat in the water