Flood causes much damage to nature, human and animals lives. So as solution for this problem.we have to come with the idea of Flood detection and avoidance system using raspberry pi 4. This gives us idea about the flood, which help to move or save the people to safe place, and try to avoid the damage to the human lives or animal lives and also protect the property. In this project we use latest version of the raspberry pi 4 with some latest sensors, with these sensors we will detect the water level to alert people or organisation unit via SMS with the help of SMS gateway system