Evaluation of pesticides contents in cultivated soils in the Roujan catchment area.

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.

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.

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.

A flow tower is installed on the watershed of Roujan as well as a meteorological station of the AgroClim service unit (INRAE). At these points a set of sensors are arranged in order to collect various meteorological variables such as wind speed, air humidity and temperature, global radiation or evapotranspiration. Just like the other measurements made on the basin by sensors, data acquisition units record the values which are transmitted several times a day to our servers at the INRAE centre in Montpellier or retrieved via Agroclim's webservice. R routines are then used to process these data and prepare them for integration into the HYSAE database of the LISAH, thus integrating them into the information system for OMERE. Through the OMERE data web portal, the address of which is given in this fact sheet, the data can be consulted and downloaded.

Runoff and stream flow discharge have been monitored since 1994 at the outlet of the Kamech catchment, and since 2005 at four sub-catchment hydrological stations. Automatic sensors continuously collected and transmitted water level time series to servers in Montpellier (France). Verification and correction processes on the raw data, as well as the generation of elaborated data (e.g. calculation of runoff, discharge from water levels, modification of time steps, etc) are applied before integration of the data sets into the HYSAE database. The time series can be downloaded from an interactive map through the OMERE data portal accessible from this page.

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.