According to an assessment made by Rashtriya Barh Ayog, an area of 31,500 sq km of Assam is flood prone. That means 39.58 per cent of the State’s total land is prone to floods.The assessment was made through Updated Flood Hazard Atlas. for Assam State prepared by the National Remote Sensing Centre of the ISRO. The Atlas was released on Tuesday. From 1998-2015, as much as 28.75 per cent (22.54 lakh hectares) of the land has been affected in Assam due to floods. Out of this area, about 1.55 lakh hectares of land falls under high to very high flood hazard categories.