The north of France, Wallonia and Flanders are three regions in which waterways are largely interconnected. The relatively flat landscape leads to significant sedimentation rates and high flushing requirements, which can be accentuated by the intensification of rainstorms in relation to climate change and promoting soil leaching. The management methods specific to each region also have their limits and the observation is unanimous overall and cross-border: none of them have sufficient solutions to manage these materials extracted from the waterways. The purpose of the VALSE project is therefore to reuse of these materials currently considered as "waste". This work will require the implementation of structures such as landscaped mounds or cycle paths, which give priority to effective integration in the territory and the sustainable use of these materials. The project represents a real opportunity for the stakeholders in the cross-border region to have a concerted approach, to compare the initiatives launched by each partner and to assess their viability.