Flood hazard analysis in Mumbai using geospatial and multi-criteria decision-making techniques

Abstract

Flood risk assessment remains a crucial element, particularly within locations highly susceptible to repeated flood occurrences. This study seeks to conduct an elaborate flood risk analysis for Mumbai, India based on an integrated method of geographic information systems and analytic hierarchy process (AHP). In this study, land use/land cover, average annual rainfall, elevation, drainage density, normalized difference vegetation index, distance from rivers as well as distance from roads are identified and considered. For this reason, the expert survey utilizes the AHP weights so as to find out the significance of these factors towards flooding danger. Investigations show a flood risk index and a corresponding map for Mumbai, where all areas are divided into risk zones very low to very high. Very high risks are particularly situated along rivers. Such details offer critical knowledge to policymakers who will undertake informed emergency preparedness measures designed to shield Mumbai's citizens and assets. Therefore, this research is considered as one of the modern techniques for flood risk assessment, which can be applied in other flood-affected areas worldwide. HIGHLIGHTS Merges the geographic information system and the analytic hierarchy process (AHP) for Mumbai flood risk, giving a holistic view.; Evaluate land use, rainfall, elevation, and river proximity, enhancing risk assessments.; Introduces the flood risk index from the AHP, aiding targeted emergency plans.; Detailed flood risk map divides Mumbai into ‘Very Low’ to ‘Very High’ risk zones for precise mitigation strategies.; Offers a modern flood risk model, valuable worldwide amid climate change impacts.;

Keywords

• analytic hierarchy process (ahp)
• flood risk assessment
• flood vulnerability
• geographic information systems (gis)
• mumbai flooding