Water Management

The key to water management is the monitoring of water level, water flow and water quality.

For monitoring ground water level and salt intrusion, Observator offers a monitoring set consisting of sensor, data logger and GPRS modem. This set can be fitted completely into a well. User friendly software shows all results on your desktop and alarms you if parameters are out of range.

For monitoring water level, water flow and water quality in rivers, lakes, estuaries and so on, we offer integrated systems with many options for power and telemetry. These stations can be mounted on a pole in the water or in a cabinet next to the water. They are powered from mains, solar panels or batteries. Data is transmitted by GPRS or for remote areas, by radio or satellite. For larger water surfaces, the same systems can be installed on our data buoys.

For enforcing water quality and tracking down sources of pollution, we offer a range of mobile solutions. These can be installed quickly and covertly. They will issue a warning on a mobile phone whenever pollution is detected.


SewerGuard is a monitoring system for Combined Sewer Overflows. In a CSO, waste water is discharged onto open water when the capacity of the sewage system is exceeded. For proper management of the sewage system, it is necessary to monitor the level of the sewage water and to register the frequency and volume of the discharge onto open water.

With SewerGuard, monitoring equipment is installed in each CSO. The measured data is transmitted to a server computer via the mobile telephone network (GPRS). User-friendly software allows users to view recent and historical data. Also, automated overview reports can be generated and alarm conditions can be signaled.

The equipment installed in the CSO consists of:

  • A pressure sensor for measuring the water level.
  • A data logger with GPRS modem for logging the water level and transmitting it to the server.
  • A liquid level sensor (float switch) for activating the logger in case an overflow is imminent.

If the water level is low, the logger will wake-up twice a day, measure the water level, send it to the server and go back to sleep. Power consumption is extremely low in this case. If the water level rises high enough to activate the liquid level sensor, the logger will wake-up every minute to measure and store the water level. Every 15 minutes the stored values are send to the server. (The numbers are just examples.) Thus frequent data is available during high water, while power is saved during low water. For most CSO's the small battery in the logger (which powers the complete system) will last for one to two years.

The measurement data from multiple CSOs is received on a server computer. The SewerGuard software stores data in an SQL or other data base. The overflow rate (volume per second) is calculated from the water level and the physical structure and dimensions of the CSO. Advanced software allows multiple users to view the data in the form of charts and tables. The software generates easy readable reports showing the number of overflow events & the associated overflow volume. All data can be accessed via a web interface. Data can be exported in various formats.

The standard version of SewerGuard can easily be augmented with additional sensors, for example for measuring the level at two points or for measuring water quality parameters. Alternative power options (power grid or solar) are available. The software can be licensed or be hosted by Observator.

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