Runoff and stream flow discharge monitoring in the Roujan catchment area (Hérault) is operational since 1992 at catchment and sub-catchments hydrological stations on which automatic sensors records water level time series on a long-term and continuous basis. The data from these sensors are collected and instantaneously transmitted to servers in Montpellier. Verification and correction processes on the raw data, as well as the generation of elaborated data (e.g. calculation of flows from water heights or modification of time steps) are applied before integration of the data sets into the HYSAE database. The water level and discharge time series can be downloaded from an interactive map through the OMERE data portal accessible from this page.

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.

The physico-chemical parameters measured in the Kamech basin and accessible via the data portal concern the electrical conductivity of the water.

Water sampling in rain, runoff and undergroundwater are performed on the fields and send to a specialized laboratory to quantify major elements contents (Ca, Mg, Na, K, SO4, PO4, HCO3, NO3) ( FILTRATION ???. PH ??? ? EC, ???)

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.

A meteorological station and a flow tower have been installed in the Kamech watershed. Through these two stations, a set of sensors is arranged to collect various meteorological variables. The meteorological station, installed in 1998, is equipped with sensors that are placed two meters above the ground. These sensors allow the acquisition of global radiation, wind speed and direction, air temperature and humidity, atmospheric pressure. The instruments used are: pyranometer, anemometer (A100R, vector), wind vane (W200P), thermohygrometer (HPM45C, vaisala), barometer (CS100, Setra). The flow tower or micro-meteorological station, installed in 2010, is equipped with sensors installed at 10 meters from the ground, allows to measure the real evapotranspiration (ETR) by the turbulent covariance method. This method is based on high frequency measurements (10 to 20 measurements per second) of vertical wind speed, air temperature and air humidity. The instruments used are: sonic anemometer (CSAT3, Campbell Sc), icor 7500, air temperature and humidity (HMP45, vaisala). Additional sensors measuring temperature, relative humidity and speed are installed at 2 m height from the ground allowing to have a second point of measurement of the meteorological variables on the BV. A data acquisition system calculates and stores the average values over 30-minute time intervals. The data are collected by the staff of INRGREF of Tunis. They are processed, prepared in the format of integration in the database HYSAE of LISAH to be integrated into the information system of OMERE Through the OMERE data web portal, the address of which is given in this fact sheet, the data can be consulted and downloaded.

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.

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.

Isotope analysis of groundwater, rainfall and surface water in the Roujan watershed area. Samples of rainfall accumulated over a day or an event as well as instantaneous samples of runoff and groundwater are sent to a specialized laboratory to determine their oxygen 18 and deuterium contents.

The physico-chemical parameters measured in the Roujan basin and accessible via the data portal concern the measurement of elements such as pH, redox potential, temperature and conductivity, carried out during sampling in the basin.