Flood Hazard and Risk Zonation in North Bihar Using Satellite-Derived Historical Flood Events and Socio-Economic Data

North Bihar is one of the most flood-affected regions India. Frequent flooding caused significant loss life and severe economic damages. In this study, hydroclimatic conditions historical flood events during period 2001 to 2020 were coupled over different basins in Bihar. The main objective study assess severity floods by estimating hazards, vulnerability risk uniqueness at village level as no such was performed earlier. Other thematic data, namely, land-use drainage networks, also utilised with maps validate event. MOD09A1 satellite data (during 2001–2020) derived indices used derive inundation extents frequency. Socio-economic (SEV) based on seven census parameters (i.e., population density, house-hold literacy rate, agricultural labour, cultivator, total male, female) hazard region. exhibited that a ~34% geographical area inundated last 20 years maximum extent seen 2020. Flood map ~7%, ~8%, ~13%, ~4%, ~2% mapped under Very High, Moderate, Low, Low categories, respectively. 2770 3535 number villages categorized High zone which are located north-central central-western regions. These findings can be applied distinguish classify areas various zones assist mitigation management activities.