This operation must enable: — The realisation of the first stage of the project for the assessment of damage related to the floods of the Seine and the Marne Franciliennes; — The realisation of a flooding AMC to assess the socio-economic relevance of the construction of the pilot site and the overall water development project of the Bassée, on the basis of the results of the first stage. The expected results of this operation: — To have a comprehensive inventory of the Parisian stakes subject to the risk of flooding by river overflow, as a starting point for the construction of the damage assessment tool and the realisation of the CMA of the Bassée project. — Integration of the CMA into the file submitted for the mid-2020 public inquiry at the end of 2019.