Propwash ground/water visible effect when low flying making a bow in the water - dust on ground

[Mysticpuma]

So this is a single engine seaplane takeoff from the 2m 51s mark in the video and it shows the pressure wave behind the aircraft deforming the water.

The old IL2 had this effect too:

 

It's such a small effect but adds to the realism and immersions as the aircraft is interacting visibly with its environment.