Pesticide contents are determined on the suspended matter extracted by filtration (0,7µm) in runoff water. Contents allow quantification of particula transport of pesticides and allow too compare it to solute transport.

The thematic map provided allows you to visualise the measurement points concerning this data acquisition device. This map is accessible via a standardised WMS flow, but also enables the data sets associated with the measurement point to be downloaded, depending on the case, via the ORE OMERE data portal.

The evaluation of soil moisture in different areas of the Roujan catchment area is carried out by measuring the moisture content of fresh soil samples.

These data correspond to a non-systematic monitoring of dissolved, particulate or total organic carbon contents in water (rain, surface overflow, underground water) in the Roujan catchment area.

Soil moisture assessment in different areas of the Kamech catchment area is carried out using soil tensiometry measurements carried out on different areas and at different depths of the Kamech site.

OMERE is part of the study of global changes affecting Mediterranean hydro-agrosystems. It focuses on a hydrological context that is intermediate between arid and temperate environments and subject to a wide range of hydrological processes ranging from intense droughts to extreme floods, and on a social and human context that is currently undergoing considerable changes (intensification of agricultural production in favourable areas, abandonment of land that cannot be intensified, increase in catchment areas, hydro-agricultural or conservation developments) linked in particular to a rapid increase in population density. The various climate change scenarios developed by the IGCC predict major rainfall changes at these latitudes: a decrease in winter rainfall, an increase in stormy rainfall and extreme rainfall. In this context, the observatory is based on the acquisition of climatic, hydrological, sediment and solute flow records over the past two decades in two elementary Mediterranean catchment areas that are differentiated in terms of soils, hydro-agricultural developments, farming practices and their evolutionary dynamics: Roujan (France, mainly cultivated with vines) and Kamech (Tunisia, mixed farming). The observatory aims to i) understand the impact of agricultural activities on mass flows in elementary Mediterranean catchment areas: The observatory aims to i) understand the impact of agricultural activities on mass flows in elementary Mediterranean catchment areas: hydrological regimes and balances, allocation of water resources, erosion dynamics, changes in water quality; ii) assess the intensities and speeds of quantitative and qualitative changes in water and soil resources as a function of changes in land use; iii) support the development of approaches for modelling flows in cultivated areas; iv) provide scientific bases, references and diagnostic tools for agri-environmental engineering of cultivated landscapes OMERE is co-managed by four French and Tunisian laboratories (HSM, INAT, INRGREF, LISAH). It is part of several networks, including the OZCAR research infrastructure (https://www.ozcar-ri.org/), and is a stakeholder in the CRITEX project "National park of innovative equipment for the spatial and temporal study of the Critical Zone of Watersheds" selected by the Ministry in the framework of the 2nd wave of the call for projects "Investissement d'Avenir Equipements d'excellence".

water samples ( rain, runoff, underground water) are carried in icebox and frozen. ( FILTRATION ? ). Samples are analyzed by a dedicated laboratory, that quantify a set of parameters including from 1 to 430 pesticide active ingredients and their metabolites.

The monitoring of suspended sediment loads in runoff and stream flows aims to quantify the amount of sediments translocated during runoff events. These measurements contribute to the understanding and the quantification of the soil redistribution induced by water erosion processes. The measurements of suspended matter are made through manual and automated water sampling at the hydrological stations, which are then processed and analysed in the laboratory to derive suspended sediment concentrations. A turbidimeter has been recently installed to complete the time series of sediment discharge. Suspended sediment concentrations are integrated into the HYSAE database, they can subsequently be consulted and downloaded via the OMERE data portal.