In the case of the flushing chamber with a flush gate, the lower opening of the flushing chamber is closed by means of a flush gate. The filling of the chamber depends on how the sewage flow is guided and can, for example, be implemented by arranging a restrictor or via check flap gates in the chamber walls. Depending on the operation mode and the system type, the opening of the gate is triggered either by a water level measurement (with auxiliary energy) or a floating gauge (without auxiliary energy) [Dettm2005a].