Floods are probably the most recurring, widespread, disastrous and frequent natural hazards of the world. This geomorphic hazard is common in West Tripura District as it is situated in a tropical monsoon region. Lohar Nala flows for 22.53 km distance in Mohanpur Rural Development Block, West Tripura District. About 20-25% of the total basin area (102.51 km2) is flood affected. This study aims to identify the flood affected mouzas and to prepare Flood Hazard Map of the Lohar Nala Basin, where flood pose a recurrent danger. An additive model was utilized to create a composite flood hazard index of this basin. A composite flood hazard index was prepared incorporating variables of near distance to the Lohar Nala, population density, number of households in each mouza, agricultural losses and availability of high ground (shelter). Flood hazard zones were mapped in a GIS environment. Three flood hazard zones have been identified in the basin according to these five variables among which Bamutia falls under High Flood Zone. Fatikchhara and Kalkalia mouzas fall under Moderate and Low Flood Zone respectively.The study demonstrates the potentials of GIS application in flood hazard mapping.
