Inflatable gates have a number of advantages when compared with standard steel gates. In case of flood the rubber membrane is deflated to a flat structure and placed on the weir sill. This paper deals with the energy dissipation at inflated gates, in particular the influence of the weir sill on the design of the stilling basin with respect to the described boundary conditions. Numerical investigations were carried out using OpenFOAM (Open source Field Operation And Manipulation). Additionally, experiments were performed in a physical model. The hydraulic characteristic of low Froude hydraulic jump, turbulent flow structures and the energy dissipation mechanism during overflow are presented and discussed
