The Large River Basin Management is still questioning the out-scaling to ensure the integrity of the whole watershed and to respond to the individual demand in terms of economics, water access and environmental protection. The human needs interact with quantities and qualities of the finite natural resource base. Without a comprehensive and cohesive approach of all these interactions, unprecedented pressures on land and water resources lead to highly decreasing agricultural productivity, loss of biodiversity, greater food insecurity, higher prevalence of diseases, and more water-driven issues as well as socio-economic and political instability. In this context, ecohydrology is emerging as a compelling response to the challenges the World faces. The ecohydrology enhances solution-oriented approaches and nature-based solutions related to the dramatic spatial and temporal hotspots emerging more and more everywhere. Regional hydrology and flow regime characterization within the biogeochemical and biological processes in relationship with the land use change, land cover change and societal change can emphasize the comprehension and role of the hydrological template that regulates ecosystem functioning and societal development. Nowadays, ecological and social based approaches for watershed management including ecohydrology, socio-hydrology and agroecology should be precised.
The topic of this session focuses on the scale issue: what are the most relevant and reliable variables to follow at the scale of a large basin to allow the characterization of the ecohydrological state of the basin through agroecological and socio-hydrological approaches. All kind of ecohydrological questions within agroecological and socio-hydrological issues are welcome, showing diverse approaches from field management, ground observation to satellite survey.