Date of Publication :17th January 2023

Abstract: Kerala, an Indian state which is situated in the country's southwest is bordered by the Arabian Sea to the west, is geographically susceptible to floods, cyclones, and storm surges. The region's vulnerability arises from incessant rainfall, coupled with inadequate drainage systems and limited access to sea outlets, which are primary contributors to flooding and, in some cases, flash floods. In this study, the catastrophic floods that occurred in Kerala in 2018 are analysed. Using satellite-based analysis, flood persistence maps are generated, and the impact of persistent flooding on social vulnerability is examined. Social vulnerability parameters, including Total population and Total Female population (gender), are sourced from the Census of India, 2011. The flood persistence data, derived from multi-temporal satellite observations during Aug 11-27, 2018, reveal that three districts Alappuzha, Pathanamthitta, and Kottayam are the most severely affected. Approximately 461 villages experienced varying degrees of flood persistence, ranging from 0 days to more than 10 days. The analysis serves the purpose of identifying the most severely affected villages based on the duration of flood persistence. This information aids in prioritizing relief and rescue operations, particularly in the worst-affected districts and villages. The study further emphasizes the overall extent of flood-affected areas during the 2018 floods, contributing to a comprehensive assessment of flood risk and impact in Kerala.

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