As a hydrologist and hydrogeologist, part of the Perennial Environmental Observatory (OPE in French) at the direction of science and technology at Andra, I manage and take part to several research and development and engineering projects. I am in charge of a network which monitor water quality and river discharge in an area of the north east of France, and contribute to the development of Postdocs and PhD projects, as well as engineering studies in the water sector. I have in particular an interest in understanding the different ways human activities affects aquatic environments (being groundwater or surface waters) and how these modifications subsequently affect our livelihood and economy (water resource contamination, flood risk, modification of ecosystems we depend on..). I developed this interest looking at environmental and health risk through a consultancy experience in contaminated site management. I then focused on sediment, nutrients transfers, and flood risk in several catchments doing research in UK. I then put these experiences together during a PhD in Ireland, to research the effect of groundwater-surface interactions and river inputs on coastal areas nutrient cycles, and their impact on aquaculture. Finally my current position as hydrologist/hydrogeologist within the science and technology department of Andra and the OPE allow me to contribute to better understand aquatic environments and their changes.