Rob
Forum Moderator

OK, and if you use the pressure calculation of dP = rho.g.h how much free surface deflection would you expect with around 30Pa of pressure? 

Open channel is the better option here, but you do need to set the water and air velocity to mimic the flight speed. The problem then is preventing a hydraulic jump as water tends not to want to move overly quickly. You may also trigger air speed derrived waves if you're not careful.Â