An affordable early warning system is now available to provide flood alerts based on the water level at strategic points in a river's catchment area or that of a stream.

The system uses building blocks linked together to provide the necessary surveillance for a specific application scenario.

The basic building blocks of the surveillance system are field terminals and base stations.

A simple installation consists of a field terminal communicating with a base station. (i.e. A 1-to-1 configuration.) In this configuration, the system can operate autonomously without an Internet connection. However, when connected to the Internet, the collected data is logged remotely, and flood alerts can be relayed to a broader audience. (Using, for example, Twitter or other platforms.)

Multiple field terminals can also communicate with one base station. (i.e. A many-to-one configuration.)

More complex configurations are possible where single-terminal and multiple-field-terminal installations share information via the Internet.

Where base stations are connected to the Internet, the gateway to the Internet must be connected to battery backup to ensure that it will remain operational during power outages.  For more info click here: Harbinger