The experimental monitoring of an asymmetrical flow pattern, realised on a physical model at the Laboratory for Applied Hydraulics of HEPIA, yielded accurate dimensioning of a flow limitation device and appropriate riverbank protection design. The studied structures were then implemented on the Aire River in Geneva. The main goals of the Aire River revitalization program in Geneva are: hazard and risk mitigation. Inundation risk is mitigated for the Q300y=120 m3/s design discharge by an orifice-weir structure yielding a 400'000 m3 flood retention devices [1] preserving the orifice of driftwood clogging. Since upstream from the orifice flow conditions are strongyle asymmetrical, velocity field needed to be monitored on a physical hydraulic model [2]. Velocity measurement was carried out by means of Met-Flow UVP probes and the shear stress calculated. The experimental analysis results yielded an appropriate orifice geometry and riverbank protection design.