The hydraulic system of the bathing water of the Pas des Ondes reconstitutes a natural scheme of operation thanks to its settling basin where circulates the water that comes from the Oule with a flow rate of 30 L / s. The purpose of this pond is to filter and capture the fine particles of silt in suspension to limit the turbidity of the water and to keep a maximum of clarity for swimming. Once past the swimming lake, the water flows into the fishing pond before returning to the Oule.