Smart Rainfall System is a patented environmental monitoring system (IT granted, n. 0001412786; EU pending, n. EP2688223) that measures the rainfall intensity by means of the analysis of satellite television’s signals received by commercial parabolic antennas and estimates the runoff potential by means of a continuous hydrological model. Since the satellite signal is attenuated by the atmospheric precipitation, SRS uses an electromagnetic model to retrieve one-minute rain intensity observation for each sensor deployed in the monitored area. The central elaboration server parses the measurements from the sensors network, and performs real-time visualization of the rain and flood risk maps basing on a web-GIS platform.