The floods in Brabant Wallon of July 2021 illustrated the vulnerability of local territories to the effects of climate change. In order to cope with the pressures exerted by climate change on local territories, literature [Lettre 18/20, Plateforme wallonne pour le GIEC, 20/21], as well as field experience, reveals the need for: - a multi-scale approach, considering flood isssues from the main watershed to the multiple local runoff axes, from the plateaus to the valley bottoms; - a multi-disciplinary approach, involving climate sciences, agronomy, engineering, urban planning, architecture, social and political sciences, etc.; and - a multi-stakeholder approach, involving political representatives, administrations, citizens, associations and socio-cultural actors, academic experts, innovative entrepreneurs. In this context the interdisciplinary research platform Louvain4Water of UCLouvain, and the Maison de l'Urbanisme du Brabant Wallon, with the support of the Province du Brabant Wallon, organized a series of meetings dedicated to the co-construction of a diagnosis of the causes of the floods in this region and to the co-design of possible solutions to mitigate and adapt to floods. From september to december 2021, a first cycle of cross-teaching activities (AGRO, EPL, LOCI) between the members of Louvain4Water laid the foundations for a round table event. This event took place in february 2022 and brought together more than hundred people from the public sector (provincial deputies; mayors and aldermen; urbanists; urban planners, environmental and municipal public works departments; environmental advisors; agents from the regional GISER service), actors of the civil society ((Fédération Wallonne de l’Agriculture, Contrat de rivière Dyle-Gette) and actors of the academic sector. Louvain4Water then drew up a summary of the diagnosis and solutions proposed by the participants. From april to june, several meetings with the cabinet of the Provincial Deputy in charge of flood risk management led to the official ...