Flood Risk Analysis in the Kosi River Basin, North Bihar using Multi-Parametric Approach of Analytical Hierarchy Process (AHP)- Sambal member upload

The Kosi River in north Bihar plains, situated in eastern India presents a challenge in terms of long and recurring flood hazard. Despite a long history of flood control management in the basin for more than 5 decades, the river continues to bring a lot o

BY: Trishala Singh
Original Source / Author: R. Sinh, G.V. Bapalu L.K. Singh, and B. Rath 08 Jan, 2018

Flood Risk Analysis in the Kosi River Basin, North Bihar using Multi-Parametric Approach of Analytical Hierarchy Process (AHP)

The Kosi River in north Bihar plains, situated in eastern India presents a challenge in terms of long and recurring flood hazard. Despite a long history of flood control management in the basin for more than 5 decades, the river continues to bring a lot of misery through extensive flooding. This paper revisits the flooding problem in the Kosi river basin and presents an in-depth analysis of flood hydrology.The hydrological analysis has been integrated with a GIS-based flood risk mapping in parts of the basin. Typical hydrological characteristics of the Kosi River include very high discharge variability, and high sediment flux from an uplifting hinterland. Annual peak discharges often exceed the mean annual flood. It inundates the t low-lying tracts of the alluvial plains year after year. Flood risk analysis follows a multi-parametric approach using Analytical Hierarchy Process (AHP). It integrates geomorphological, land cover, topographic and social (population density) parameters to propose a Flood Risk Index (FRI). The flood risk map is validated with long-term inundation maps and offers a cost-effective solution for planning mitigation measures in flood-prone areas.
 

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