This study is part of the transfer of GEMAPI competence of the EPCI-FP from the watershed to the Syndicat Mixte du Bassin de l’Agly (SMBVA). The SMBVA recovers the management of flood protection works, including the protection dikes of the Maritime Agly, classified as A, until now managed by the Departmental Council 66 and the Division’s Agouille dike in Saint-Laurent de la Salanque. In order to comply with its obligations, the SMBVA will seek recognition of a containment system with existing protective structures and according to their current condition (without work). This is the first step in the process to secure the flood protection works of the Agly Maritime Floods.