The Médard lagoon has poor water quality (dystrophic crises) in relation to the arrival of different pollution streams (classified “poor ecological and global state” according to DCE parameters). In addition, a hydraulic management issue maximises the impacts associated with organic inputs bouling the annual nutrient cycle. The now outdated hydraulic structures do not allow proper management of water intakes and outlets. In fact, there seems to be a need for concerted management plans on ponds and wetlands. This project therefore aims to restore the quality of water and aquatic environments, the proper functioning of associated wetlands, the sustainability and sustainable development of activities, the maintenance and restoration of fish continuity, etc.