Although our knowledge of the impact of climate change on hydrology and water resource availability in France has progressed significantly in the recent years, our ability to think prospectively about sectoral and spatialized adaptation and mitigation strategies remains limited, especially in the long term and at a large scale (France). We observe that we do not currently have an integrative multisectoral modeling approach that places water in its various dimensions (production factor, common resource, public good) at the heart of the analysis. This is the main challenge of WAT-IMPACTS, which proposes to develop regionalised dynamic macro-economic models at the scale of France (Computable General Equilibrium (CGE) modes) explicitly integrating hydrosystems in order to assess the long-term economic (in particular on employment, economic growth and competitiveness), social (inequalities between categories of economic agents or between sectors) and environmental impacts of future water resource evolution scenarios. WAT-IMPACTS will also question sectoral adaptation and mitigation measures by proposing accompanying measures (public water policies) within the framework of long-term prospective approaches (national and territorial) involving water stakeholders. One ambition of the WAT-IMPACTS project is to produce innovative scientific common goods useful to a wide range of stakeholders. Thus, the production of structured, documented and reusable data will be an objective of the project. WAT-IMPACTS aims at producing conceptual and operational works on tutelary values of water. Such values, spatialized and likely to vary over time, allow to indicate to private actors, but also to public authorities, the social value associated with saving or protecting the water resources in different contexts.