Small agricultural catchment (91 ha) in a vineyard Mediterranean environment with 20 years of data: impact of global change (climate and anthropogenic activities as agricultural practices) on water and erosion balance, fluxes and quality. Soils: calcisoils and cambisoils. Bedrock: Marine and coastal miocene deposits. Continuous automatic measurements at nested scales from plot to catchment outlet (surface runoff, shallow groundwaters, surface-atmosphere fluxes) and continuous monitoring of anthropogenic activities . More information available on http://www.obs-omere.org. Roujan experimental catchment belongs to the French SOERE-RBV Network.