Assessment of Flood Hazard Zone Using Remote Sensing & GIS ? A Case Study of Subarnarekha River Basin

Flood is the natural hazards on the Earth surface, it is a relatively high flow of water that overtops the natural and artificial banks in any of the reaches of a stream. When banks are overtopped, water spreads over flood plain and generally causes problem for inhabitants, crops and vegetation. We cant control the flood hazard but if we awarded about this deserter we can protect and save the people life, property and other resources. The development of modern technology GIS is a powerful tool for identify the flood risks zone for planning and management against this natural hazard. Subarnarekha river basin is one of the major river basin in east India. Using satellite (Landsat-7 ETM+ & DEM) image, other related base map (River basin, Geology, Soil & Top sheet) and district wise rainfall data the flood hazard map were prepare in the GIS environment help of Arc GIS software. The weighted overlay analysis method used to prepared final flood hazard map using suitable feature class weighted values. The final flood hazard map divide into five categories Very high, High, Moderate, Low and Very Low. The major findings of this study, downstream part of Subarnarekha river basin is high to very high flood hazard risk fall in Baleswar and Mayurbhanj district in Orissa, East Singbhum and West Singbhum district in Jharkhand and West Medinipur District in West Bengal the part of Baleswar district is totally under of High flood hazard risk zone. In this study helps to concern the authorities to formulated their development strategies according to the available risk to the area.