Metasphere Case study: Regional Water

Company Stara Zagora, Bulgaria

Metasphere Case study: Regional Water

  • Since implementing a CSO Monitoring System The Regional Water Company Stara Zagora has benefited from safer and more reliable monitoring of its sewer network.
  • The new CSO System has generated data and events that have enabled the temporal and geospatial identification of incidents and quicker corrective actions.
  • Fast and effective response to uncontrolled spillages has reduced the risk of environmental damage and any associated financial costs.
  • The data collected and information provided has allowed the integration of analytical services and greater predictive operation, maintenance and management.
  • The control of both assets and processes has been improved with access to data for both on-line and off-line analysis and modelling.



The Regional Water Company of Stara Zagora is 100% State owned and serves a territory of 5200 km2 and a population of 330,000 inhabitants. It is responsible for the operation and maintenance of a water supply and sewerage system in the municipalities of the Stara Zagora region, including the Municipality of Topolovgrad.

Industrial Systems for Automation (ISA) Ltd. is a consultancy and engineering company, specialising in control automation, information and communication applications. ISA is a distributor and engineering partner of Metasphere.


The Regional Water Company of Stara Zagora recognised a need for safe and reliable monitoring and a more efficient and proactive management of its Combined Sewer Overflows (CSO). In particular it required the early detection of potential incidents within its sewer network due to the build-up of many types of contaminants, thereby reducing the environmental impact of uncontrolled discharge. The company also wished to achieve greater optimisation of its Waste Water Treatment Plant operations.


The design, installation, system integration and commissioning of a CSO monitoring system.


The first phase of the project covers 4 overflow points in the sewer network. The equipment at each level monitoring point includes an intelligent Ultrasonic Loop-powered Transducer dBi6 and Metasphere’s battery-powered Remote Telemetry Unit (RTU), Point Orange, with external antenna and the capability to provide operational functionality, for collecting level information at sewer overflow locations, without power supply from the grid.


Point Orange is a compact Logger/RTU device with integrated battery, IP68 unit enclosure, tri-band 3G/GPRS modem, internal and external antenna options, software configurable AI, CI, DI, Modbus and SDI-12 communication options and intelligent transmitters, integrated submersion sensor, local diagnostic points, intelligent alarm reporting. It communicates with Metasphere Master Control System, DNP3 masters or FTP servers.







The ultrasonic transducer 4-20 mA output is connected to the active loop analogue input of Point Orange. The measured level values are sampled and stored with time stamps at periodic intervals of 30 minutes. Additionally, Point Orange is configured to trend diagnostic information from internal points such as temperature, battery voltage and GSM signal strength.

ISA provided a web-based solution for HMI visualisation and monitoring, including tabular and graphical reports and alarm management based on Metasphere’s telemetry platform. The software system was installed on a server at the client’s operational headquarters.



The software system is based on DNP3 OPC server for DNP3 Master functionality, OPC client, SQL server, Web server and application software. Microsoft SQL Server is implemented as a related database management system for storing and retrieving data, providing an interface to third-party software systems. Data communication is based on 3G/GPRS and DNP3 protocol, configured for connection time periods of 24 hours. A value change event is configured for generating alarms and contacting the DNP3 Master when the level changes by 0.2 meters or more. The structure of the system allows remote reconfiguration of the RTU.       









Proactive management of Combined Sewer Overflows has proved highly beneficial: the data and events generated by the CSO Monitoring System have given early detection of incidents and their location which has resulted in earlier, more effective, corrective action where necessary.

The structured information has enabled the integration of analytical services for much improved predictive operational, maintenance and management models.

The company has found it easier to monitor and control its processes and assets and is benefiting from accessing its data for on-line and off-line analysis and modelling.


N.B. The information contained in this entry is provided by the above supplier, and does not necessarily reflect the views and opinions of the publisher