eau déversoir orage surveillance

Surveillance of storm water drains  

When there is heavy rainfall, storm water drains allow the run-off of water into combined sewage systems or storm basins, or directly into the natural environment. This system prevents the overflow of water treatment plants, which would be unable to process a huge flow of waste water and rainwater. However, it does mean that untreated sewage water, even if very diluted, is sometimes released into the natural environment. In 21 July 2015, regulations were introduced to control the volumes and duration of the overflow of ‘critical’ storm water drains. Monitoring campaigns are conducted in order to ensure compliance with this legal obligation.  

Claire Group’s solutions for the surveillance of storm water drains

Developing equipment specifically designed for the control of storm water drains

The Claire Group range of sewerage system products includes various solutions designed to meet the regulatory criteria for storm water drains. These instruments, developed by Ijinus, range from the traditional rain gauge to the highly specific overflow detector, along with level, velocity and flow sensors and loggers.

Compact and self-powered, these systems can be installed in all types of infrastructure of any size, powered by electricity or not.  

Monitoring of storm water drains

Measuring water returned to the environment

21 July 2015

Date of introduction of regulations requiring the control of overflow volumes released by ‘priority’ storm water drains  


equivalent inhabitants: threshold above which the regulation of 21 July 2015 applies

1 litre of water per m2

equivalent to 1 mm of measured rainfall

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Focus on solutions

Overflow logger and sensor

This capacitive overflow sensor is a wired device that measures overflow from the sewerage system into the natural environment. It also logs the number and duration of overflow episodes.  

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    Suitable for the overflow measurement required by law when more than 2,000 inhabitants are connected to the same pumping station or stormwater overflow.

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    Compatible with occasional measurement campaigns for monitoring the sewerage system. 

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    CapAir® technology (capacitive measurement with air referential) allowing reliable and unparalleled detection of overflows in wastewater networks in the most difficult conditions.

Our solutions for storm water drain surveillance

Innovative solutions for sanitation network performance

Really simple to set up and install, the RG20 or RG25, paired with a datalogger, can be used equally well in temporary or permanent rainfall monitoring programmes. The rain gauge is connected to a logger which records the local data by radio, or on a remote supervision tool. This ‘tipping bucket’ rain gauge consists of a funnel collector with two calibrated containers designed to prevent the rain from splashing internally or externally, as recommended by the WMO (World Meteorological Organization). The data can be logged either by time stamping the bucket tips, or based on cumulative rainfall, and the device can be programmed to issue alerts.  

The wireless LNU is an acoustic imaging level sensor designed to measure water levels in difficult environments. This multi-purpose sensor, recognised for the precision of its measurements, can be coupled with a physical-chemical sensor or used with samplers. An all-in-one, self-powered system, it measures and logs data before transmitting it to a supervision platform. The LNU is simple to install, use and maintain. It can be securely programmed via radio without any physical interaction on the sensor or direct contact with water, making it easy to maintain.  

The UB-V sensor is a Doppler sensor that measures the optimal flow velocity. It can precisely measure even very low velocities from a level of 35 mm, even in water with low content of suspended particles. Particularly well-suited to the permanent diagnosis of sewerage systems,the UB-V has a very long working life and is very easy to install.  

The VLI sensor is a high-precision, multi-purpose height and velocity sensor. Fitted with a Doppler numerical velocity sensor and coupled with a pressure level sensor, it can measure velocities from a water height of 25 mm, facilitating the operation and monitoring of the sewerage system. This extremely compact device also offers extremely precise measurements. It is a multi-purpose tool that communicates with other sensors via a datalogger, to produce cross-measurements. The ‘Overflow’ technology fitted on the device can verify the relevance of velocity measurements in storm drains to augment the sensor’s autonomy.  

Pluviomètre RG2025
Self-powered RG20 / RG25 rain gauge
An independent, modular system for monitoring rainfall levels
Capteur de niveau ultrason
Wireless LNU ultrasonic level sensor
A reliable, self-powered communicating solution to monitor water levels in sewerage systems
eau déversoir orage
UB-V Doppler velocity sensor
Ultra-precise measurements, even with low flows!
VLI height/velocity sensor
A multi-purpose interfacing sensor for cross-measurements!

Designed, developed and brought to you by our specialist teams

Connected instrumentation is at the heart of Ijinus, which designs, manufactures and markets sensors and dataloggers to monitor drinking water networks, sewerage systems and water courses.

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An expert field team

The Claire Group team of experts, specialising in water supplies and networks, are at your disposal to provide support and guidance for all your projects.

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