Monitoring of water in the natural environment
As part of its flood control expertise, Caux Seine agglo manages around 160 hydraulic structures in the SAGE (Vallée du Commerce) area.
42 of these hydraulic flood control structures have been equipped with filling level measuring instruments.
These structures are spread over the entire catchment area, the furthest being located in Graimbouville (76), and the majority of them near the central towns of the Caux Vallée de Seine territory.
None of these structures had measuring instruments before 2017. During a flood event, the only way to know the level of filling of the structures in "real time" was to deploy agents on the ground. This is why Caux Seine Agglo wanted to improve its flood crisis management system by installing a network of measuring instruments on some of its structures.
These facilities form a network to alert and protect people and property in the event of thunderstorms or intense rainfall.
The forty-two most sensitive sites (out of one hundred and sixty hydraulic structures) were equipped with equipment for measuring water levels( CR 420-10 type radar) in the retention basins as well as rainfall( PLV400 type rain gauges).
These different sensors are connected to Low power acquisition stations (LNS) which are powered either by the EDF network or by solar panels and systematically backed up by batteries.
The stations manage the various information from the sensors, store it and transmit it to the central supervisor (SIGMA II) via the GSM network.
The data collected are used in the form of curves, tables, graphs, etc. and enable the capitalisation of information in order to work on the anticipation of events by drawing up different scenarios for the filling of structures, depending on the intensity and location of rainfall.
The SEMERU company carried out the installation of the various materials which were provided by the PARATRONIC company.
The instrumentation project for the hydraulic works was financed by Caux Seine Agglo (€423,500 excluding tax) and the Seine-Maritime Department (€181,500 excluding tax, i.e. 30% of the total cost).
The overall investment cost of the project is approximately €605,000 excluding VAT.
The system will enable the Caux Seine Agglo to become more efficient when human resources have to be deployed in the field.
The time saved by not having to take manual water level readings can be used, for example, to carry out safeguard actions during the crisis.
The system will enable the Caux Seine Agglo to become more efficient when human resources have to be deployed in the field.
The time saved by not having to take manual water level readings can be used, for example, to carry out safeguard actions during the crisis.
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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