- Stratification accurately suppresses the vertical component (measured as less than 3 percents of the horizontal component) - The velocity profile across the layer is parabolic at all times and quickly returns to this state if perturbed (the time constant has been measured to be on the order of 0.2s) - Under these circumstances, the equations governing the flow are 2D Navier Stokes equations + a linear friction term - Systematic comparison with 2D DNS brings evidence the system behaves as a two-dimensional system