On each site are installed multiple devices collecting data of water level, ground moisture, rainfall amount, temperature, etc. All those devices, as well as an HMI, are connected to the IG502, which is loaded with ITS’s Python application. The SCADA system sends a polling request every minute, and the IG502 acquires data via its serial ports and Ethernet ports through Modbus RTU/TCP, and then uploads data to the SCADA, creating and managing different graphic status displays, so that technicians can view the data and do analysis. If signs of floods are detected, the SCADA sends warning to local stations, so that the administration can arrange early evacuation of residents in the neighborhood.

To ensure complete and accurate data transmission, the IG502 logs all data over the day and sends logfile to the center at midnight (after polling request received) in case there is missing data in the database. Generally, logged data are kept for more than a day in case of data request later on.