Monitoring of water in the natural environment
The Ouvèze River in the Ardèche is characterised by a marked Cévennes rainfall pattern. Thus, high floods (several hundredm3/s) can occur in autumn, whereas in contrast, during the summer period, the river is marked by a severe low water level (of the order of a few litres per second).
In addition to these strong natural constraints, the subsoil of the watershed is also influenced by the presence of former iron mines. In fact, part of the river water seeps into the mines' galleries.
Thequantitative management of water resources is therefore a major challenge for the region and is the subject of a Water Resource Management Plan drawn up by the Privas Centre Ardèche Urban Community (CAPCA).
Within this framework, and in order to better understand the hydraulic functioning of this particularly complex system, CAPCA acquired limnimetric stations to equip 7 sites on different rivers of the basin.
These stations, installed in June 2017, will make it possible to measure flows over several years and thus improve knowledge of the hydrological functioning of the basin. More specifically, the data acquired will make it possible to understand the infiltration/restitution phenomena linked to the former mine galleries.
CAPCA selected SNA piezometric probes coupled with MAC10R acquisition stations for data recording and storage. The probes were placed in a polyethylene pipe attached to a metal angle to anchor them securely and protect them from shocks.
The installation was carried out in control, with the technical support of a technician of the company PARATRONIC and DREAL (SPC Grand Delta, hydrometry service).
As the recorded data correspond to water heights, calibration curves are being drawn up at each site in order to obtain the flow rates at each equipped site.
MAC recorders were developed to instrument measurement sites without power supply that do not require live data repatriation or alerts. Their internal capacity allows 16,000 measurements to be recorded over a period of up to 10 years.
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