Wide gap, approximation 

Jet for an elongated split parallel to and along a flat smooth bottom (2-dimensional flow), first approach.

The difference between the free jets lies in the jet growth which is about 30 % smaller is and the velocity distribution that is now asymmetrical in shape. The lowest part of the velocity distribution (under um), the boundary layer can be described with a power law, while the uppermost part has a Gaussian distribution. Both parts can be reasonably well described with an error function. For x = 12 b0, an elongated inflow opening and a jet along a smooth wall (2-dimensional flow)