The SCFB consists of the floating walls that will be installed in a concrete basin. The concrete basin will be pre-cast to any length to suit the floating wall increments. The SCFB works with a simple concept using the raising water level to activate the system. Once the rainwater reaches a certain activation level, the SCFB will be automatically activated. This system is most suitable for commercial buildings, underground car park, drainage, canals and flood prone coastal areas.