Kerala floods (2018)

Kerala floods (2018)
Name	Kerala floods (2018)
Caption	Flooded landscape in Kerala during 2018
Date	August–September 2018
Location	Kerala, India
Type	Flooding, landslides
Fatalities	estimates vary; hundreds
Displaced	over a million

Kerala floods (2018) The 2018 Kerala floods were a large-scale hydrological and humanitarian disaster that affected Kerala in India during August and September 2018. Torrential monsoon rains, reservoir overflows, and widespread landslides caused inundation across districts such as Kozhikode, Wayanad, Idukki, Kottayam and Alappuzha, prompting national and international relief operations. The catastrophe mobilized agencies including the National Disaster Response Force, Indian Air Force, Indian Navy, Kerala State Disaster Management Authority and numerous non-governmental organizations such as Indian Red Cross Society, SEEDS India and Kerala State Disaster Management Authority affiliates.

Background

Kerala's geography—part of the Western Ghats and bordered by the Arabian Sea—features high-rainfall catchments like the Periyar River and Bharathapuzha River. The 2018 monsoon season was influenced by Monsoon of 2018, with meteorological inputs from the India Meteorological Department and patterns linked to the Indian Ocean Dipole and El Niño–Southern Oscillation. Reservoir infrastructure included dams such as Idukki Dam, Mullaperiyar Dam, Kallada Dam and Idamalayar Dam whose operations involved agencies like the Kerala State Electricity Board and Central Water Commission. Previous flood events in the region—referenced by historical responses after events like the Cochin floods and episodic Landslide in Silent Valley occurrences—framed preparedness challenges.

Timeline of events

In early August 2018 the India Meteorological Department issued heavy rainfall warnings as low-pressure systems and the southwest monsoon intensified. By mid-August, catchments including the Periyar Basin reached saturation; the Idukki Dam and upstream reservoirs recorded unprecedented inflows, prompting emergency sluice releases. Late August saw simultaneous incidents: catastrophic flooding in Kottayam and Pathanamthitta, major landslides in Wayanad and Thiruvananthapuram districts, and urban inundation in Kochi (Cochin). Throughout September, relief operations continued while water levels receded; post-flood assessments by bodies like the Central Water Commission and National Institute of Disaster Management documented chronology and impact.

Human impact and casualties

The calamity resulted in widespread displacement across panchayats and municipalities such as Aluva, Perumbavoor, Kanjirappally and Chalakudy. Casualties included deaths from drowning, landslides and structural collapse, affecting communities including plantation workers in Munnar and fisherfolk in Alappuzha. Hospitals such as Government Medical College, Kottayam and Medical College, Thiruvananthapuram treated flood-related injuries and waterborne diseases, while shelters operated in schools administered by bodies like the Kerala State Education Board and local gram panchayat offices. International diasporas from Gulf Cooperation Council countries, including migrant workers in United Arab Emirates and Qatar, contributed to remittances used for family relief.

Relief, rescue and rehabilitation

Search-and-rescue missions involved the National Disaster Response Force, Indian Army, Indian Air Force, Indian Navy, Coast Guard and state police units alongside volunteer organizations such as Kerala State Disaster Management Authority-coordinated groups, Bharat Scouts and Guides, Lions Clubs International chapters and religious institutions like St. Thomas Church parishes. Humanitarian aid came from national actors including the Prime Minister's National Relief Fund and international donors such as UNICEF, World Food Programme and International Federation of Red Cross and Red Crescent Societies. Rehabilitation programs addressed housing via the Kerala State Housing Board, livelihoods through agencies like National Bank for Agriculture and Rural Development and agriculture recovery with support from the Indian Council of Agricultural Research and Kerala Agricultural University.

Causes and hydrology

Hydrological drivers combined prolonged heavy precipitation over Western Ghats catchments with high antecedent soil moisture and rapid reservoir inflows into dams including Idukki Dam and Idamalayar Dam. Operational decisions on dam releases by institutions such as the Kerala State Electricity Board and coordination with the Central Water Commission were scrutinized. Watershed alterations from land-use change in places like Munnar—including tea and rubber plantation expansion overseen historically by colonial-era entities and contemporary plantation companies—were implicated in increased runoff and slope instability, exacerbating landslide frequency documented by geologists at institutions like the Indian Institute of Science and Indian Institute of Technology Madras.

Economic and environmental impact

Direct economic losses affected sectors: agriculture (paddy and coconut groves in Kollam, Thrissur), fisheries in Vembanad Lake and tourism in Munnar and Kumarakom. Damage assessments from the Reserve Bank of India-linked surveys and state economic reports estimated multibillion-rupee losses across infrastructure, housing and commerce. Environmental concerns included deforestation impacts in the Silent Valley-adjacent ranges, sedimentation in riverine systems like the Chaliyar River, and biodiversity threats to endemic species documented by the Kerala Forest Research Institute and Wildlife Institute of India.

Response and policy changes

Post-flood inquiries prompted policy reviews by the Kerala State Disaster Management Authority, central ministries including the Ministry of Home Affairs (India) and technical recommendations from the Central Water Commission and National Institute of Hydrology. Reforms addressed dam operation protocols, integrated watershed management involving the Ministry of Environment, Forest and Climate Change and institutional coordination among agencies such as the National Disaster Management Authority. Legislative and administrative shifts included proposals for updated hazard zonation maps by the Geological Survey of India and strengthened early warning systems utilizing the India Meteorological Department and satellite data partnerships with Indian Space Research Organisation.

Category:Floods in India Category:2018 natural disasters Category:Kerala