Monitoring of water in the natural environment
The Syndicat mixte du bassin supérieur de l'Orge (SIBSO) was a public establishment for inter-municipal cooperation that brought together 23 communes. Based in Ollainville (91), the syndicate intervened in the catchment area of the Orge, Renarde and Rémarde rivers, for a total linear distance of about 130 km.
It became Syndicat de l'Orge, de la Rémarde et de la Prédecelle on1 January, following a merger.
The May-June 2016 flood in the Barley basin confirmed the importance of having reliable hydro-meteorological data in real time, in order to organise the means of intervention in the event of flooding by river overflow. The possibility of anticipating these events is also an asset for the stakeholders in charge of protecting property and people.
At the initiative of the elected members of the syndicate, François Charpentier (flood prevention engineer) carried out the study of the basin and the instrumentation project, initiated in 2017.
The instrumentation of eight measuring points was carried out by the company SEMERU, monitoring water heights, head-flow and rainfall depending on the situation. Each measuring point is equipped with a LNS acquisition station. A SNA piezometric sensors and CR4-20 radars measure the water level, and PLV1000 rain gauges measure the rainfall.
Each station sends its data and information to the supervision system developed by the company SEGI, using a GPRS/3G modem. The low power consumption of PARATRONIC equipment has allowed the installation of these points, in total autonomy (battery), while repatriating the data every hour in normal period and every 15 minutes once the alert threshold is exceeded.
The supervision system allows for live display of measurements on the union's website for the benefit of interested parties.
In the long term, this opportunity to access new data on upstream barley will be the basis for an alert network, similar to those already set up by other local authorities on river networks not monitored by State services.
Moreover, the data obtained will then be validated and banked so as to constitute both references to improve knowledge of the watershed and reliable data for the calibration of future hydraulic and hydrological models.
LNS acquisition stations have been specially developed to meet this type of problem: monitoring of sensitive natural environments by sensors, data banking and transmission, triggering of alerts, etc.
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