Swamping is one of the most dangerous natural disasters that affect the affected part of the world, causing human deaths, destruction of places, lessening economic growth and affecting health of human beings. According to economics times published dated 14th Oct. 2019, 1900 deaths occurs in overall monsoon in India, including 382 in Mumbai. 46 people were reported as missing and overall 25 lacks people in 22 states got affected due to swamping mishap been reported causing human deaths. The work presented here is to address swamping issue by flood prevention system which reports the symptoms of danger in advance so that the chances of survival will be more in affected areas. The system provides alarm in advance by giving them the knowledge of affected places and helps to point out the location of victim places, sometimes also to protect valuable properties. Usually in urban areas, when the level of water raises above a certain marked level called threshold level, the regulatory authorities issues an order to open the gutters so as to allow flow of excessive water into it. As a result, the level of the water decreases but on the contrary, people are unaware about the opened gutter. When a person inadvertently walks on the gutter, there is a possibility of a person stumbling into it. Therefore, there is a crucial need for building a system that warns the nearby person to prevent him/her from causing an accident. The major goal of this chapter is to give warning signals to the person through proposed system. It also proposes an IoT system based on Wireless Sensor Network (WSN) in which water level sensors are distributed over a region that monitors the level of the water. As soon as the regulatory authority opens the gutters, the sensor detects the change and sends the response to the base station. The base station will send a notification or an alert to the people present nearby that area. This will led the people to avoid the affected route and follow different route or walk-aside the gutter. The system consists of water level