The study carried out by the Public Territorial Establishment of the Vienna Basin aims to establish a diagnosis of 5 works with regard to their regulatory situation and will propose in the preliminary project phase (AVP) various arrangements to restore ecological and sedimentary continuity. In the project phase (PRO), following the choice of the layout scenario chosen for each of the works, technical solutions for the works will be proposed. This operation is submitted under Action 13 of the ERDF Loire Basin POI.