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During the heavy rainfall over the monsoon period from 1 June to 18 August 2020, all 14 districts in Kerala were affected with 104 dead and 40 injured.[1][2] Four districts in Kerala were flooded on 7 August 2020 (Idukki, Wayanad, Malappuram and Kottayam).[3] Major reported incidents in relation to flooding include a landslide in Idukki district on 6 August, claiming 66 lives and an Air India plane crash that caused the death of 21 people.[4][3][5] The 2020 flood in Kerala marked the third year in a row of severe monsoon flooding.[6]
The state is reeling from the destruction: loss of lives, livestock and agriculture and damage to property of approximately ₹19,000 crore.[1][2][7][8] Kerala State Disaster Management Plan was submitted to the Central Government to improve the disaster management capacity of the state.[9][10]
Kerala is located in the south-west of India and has a tropical climate with high annual rainfall caused by monsoon rain patterns. The majority of its annual rainfall (~80%) occurs during the Southwest Summer Monsoon where warm winds from the Arabian sea cause cloud precipitation over the Western Ghats mountain range.[6] Average annual rainfall in Kerala is around 300 cm and is caused by high numbers of low-to-moderate intensity rainfall days.[11][12][13][6]
Thiruvananthapuram's Early Warning System (EWS) plan of 2016, classifies flood alerts as level 1, 2 or 3. The response to each alert level may include notifying local government, broadcasting to the public, activating response teams or evacuating high risk areas.[14] By 9 August 2020, the India Meteorological Department (IMD) had placed 7 districts in Kerala under red alert.[15]
Flood alert levels for districts of Kerala: 9 August 2020
Kerala experienced 5 low pressure systems[16] during the south west monsoon season in August 2020. This combined with strong winds over the Arabian Sea[17] resulted in cloudbursts[18] which saturated soil structures, further weakening bedrock, overwhelming rivers and drainage systems.[19] Kerala experienced 190% increase in rainfall in the first 10 days of August compared to normal patterns,[3] causing widespread destruction, flooding and landslides.[20][17][21][22][23] Coastal towns, such as Chellanam, dealt with floods as well as rough seas pushing back on rivers, exacerbating flooding.[24][25][26]
Tea plantation in Munnar, Idukki, showing the steep gradient of the slopes from rocky outcrops, shola forests to the low-lying tea plantations
An analysis of the most significant landslide in the Pettimudi tea estate, Munnar, Idukki, found that the area experienced "extremely heavy rainfall" as classified by the IMD between 3 and 10 August.[5] Rainfall volume peaked at 612mm falling on 6 August[27] with the landslide occurring at 22:45 IST. Categorised as "rain induced debris flow"[5][27] the landslide was characterised by rapid water flow at a steep gradient, flowing at high velocity from the rocky outcrops through the shola forest collecting loose material along its course to the tea plantation and worker's living quarters below. Additional landslides occurred in Idukki, Mundakkai, Kakkayam in Kozhikode, Nilambur in Malappuram and Kottayam.[24][28][29][27][30][31]
Factors compounding flooding and landslides in Kerala 2020
Deforestation and slope alteration (including agriculture, mining and quarrying)[19][32][33]
Overview of Kerala district map depicting August 2020 flood-related incidents
The landslide in the Pettimudi tea estate saw significantly heavy rainfall, resulting in excessive flooding and landslide over a 1.2 km tract. Final reports indicate that it destroyed 4 buildings and killed 66 individuals.[5][36][37] Majority of the victims were descendants from the Dalits caste system.[38][39] Meanwhile, low-intensity mudslides and landslides occurred in other regions.[24][28][29][27][30][31]
On 7 August, the monsoon rain also caused poor landing conditions at Kerala's Calicut Airport. Due to the COVID-19 pandemic, only repatriation flights were allowed.[40] On the 3rd landing attempt, Air India Express Flight 1344 crashed after it slid down a 9-10.5m slope off the runway, killing both pilots and 19 passengers.[41][42][43][44]
The aircraft type (Boeing 737-8HG) involved in Air India Express Flight 1344's incident
Search and rescue efforts in this area were stalled due to bad weather conditions.[45] The collapse of the Periyavarai bridge, which is the only connectivity for interstate transport between Munnar to Marayur was also an issue.[46] Authorities reported closure of multiple routes including the Pala-Erattupetta road in the Kottayam district where the Meenachil River overflowed into neighbouring towns.[47] Destruction of power lines further affected communication links to the area which caused logistical difficulties in the supply of basic necessities.[48]
Evacuation and relocation efforts led to many residing in temporary relief camps.[24][49] A mild increase in COVID-19 cases was reported in Chellanam's relief camps, complicating the situation.[26] Agricultural produce was also affected with loss of crops, especially in Kuttanad, and disruptions to transportation caused an increase in food prices.[7][50][51]
The primary response at the state and national level was to set up relief camps for the flood affectees. A total of 6,300 camps were arranged in the state.[55] In Kollam alone, 51 camps were set up, one in each taluk.[55] The national government also announced ₹200,000 to be distributed among families of casualties of landslides caused by the floods, and ₹50,000 provided to the injured, both through the Prime Minister's National Relief Fund.[56] Kerala's State Disaster Management Authority (KSDMA), police and Indian Air Force actively took part in the rescue operations.[57] To search for missing persons, the National Disaster Response Force (NDRF) was activated, with around 200 personnel.[56] Fire Force and Forest officials also joined the response teams.[58] This task force consisted of 50 Fire Force members specializing in night-time rescue activities.[58]
In the aftermath of 2018 Kerala Floods, the Indian government refused international aid for relief efforts.[59] They cited sufficient domestic capacity to deal with the disaster, in line with its policy to accept no foreign aid.[60] It is also seen as a measure to portray the image of India being well equipped to address its needs,[61] and thus little International aid is accepted.[62]
The rugged terrain of Kerala made relief efforts quite challenging for national and international response teams. To fill this gap, local organizations like RIGHTS who were familiar with the geography and had deep local connections rose to the challenge.[63] IAG Kerala and Sphere India assisted in closely monitoring the situation.[56] These grassroots bodies prioritized safeguarding of children and vulnerable populations, putting focus on ensuring their education continues uninterrupted. This was also supplemented by direct cash transfer to their families.[63]
Political and social activists also joined in the efforts in their personal capacities. P.B. Nooh, the District Collector, used his Facebook presence to conduct frequent live sessions to provide updates on relief efforts to the affected population.[55]
Kerala is vulnerable to multiple hazards with flooding in 2018, 2019, 2020 and 2021 and 43% of the state prone to landslides.[64][65][9] Kerala State Disaster Management Plan outlines the need to reduce hazard risk with mitigation, preparedness, response and recovery.[9][10]
Structural measures consist of 81 dams, reservoirs and flood embankments. Non-structural measures include flood hazard mapping and landslide zoning, but larger scale maps are needed to develop effective mitigation plans.[64][66] River discharge is monitored at 38 river gauging stations by the Central Water Commission.[67] Kerala has 68 rain gauging stations, but the Bureau of Indian Standards recommends 265 to sufficiently monitor rainfall.[65]
IMD monitors weather and Kerala State Emergency Operations Centre (KSEOC) issue colour coded extreme weather alerts.[67] KSDMA provides public alerts through their website and social media platforms.[67][68] KSEOC is working with the Geological Survey of India, Kerala University and Kerala Development and Innovation Strategic Council to develop a landslide early warning system.[69][70] In 2020, 14 permanent multipurpose shelters were constructed by KSDMA with funding from the World Bank.[71][72] Civil defence systems have increased training to support search and rescue efforts and the government has given greater autonomy to local agencies and NGOs.[73][9][74]
Operations involve the implementation of disaster event preparations from Rapid Action Force (RAF), NDRF and Kerala Fire and Rescue.[75][20][28][9] During the floods, NDRF set up 6,300 relief camps with COVID-19 categorisation.[55] COVID-19 restrictions resulted in fewer vector-borne diseases.[76] Experts initially warned of increased risk of dengue in 2020, but Kerala registered five dengue deaths, a decrease from 2018 and 2019.[77][78]
Damage and cost estimates are made prior to reconstruction with funding from the State and National Disaster Response Funds.[9] KSDMA published a handbook on constructing flood and landslide resilient housing.[79] Further national and international assistance may be sought by the state.[9]
The response to the 2020 floods incorporated lessons from previous years by increasing the use of social media to broadcast flood warnings to the community, releasing water from dams earlier in the monsoon season and establishing evacuation camps for those in high risk areas.[55] Despite improvements being made, Kerala's flood alert system has been heavily critiqued for its inadequacy in responding to flood situations in a timely and coordinated fashion.[82][11][83][84]
^ abcdAchu, A. L.; Joseph, Sabu; Aju, C. D.; Mathai, John (1 April 2021). "Preliminary analysis of a catastrophic landslide event on 6 August 2020 at Pettimudi, Kerala State, India". Landslides. 18 (4): 1459–1463. doi:10.1007/s10346-020-01598-x. ISSN1612-5118. S2CID231671964.
^"Early Warning System Plan"(PDF). Municipal Corporation of Thiruvananthapuram, Kerala. 2016. Archived(PDF) from the original on 7 June 2021. Retrieved 25 October 2021.
^ abcdSrija, P.; Nithin, G.; Chaithanya, V.; Sushma, S.; Sridevi, M. (15 August 2021). "A Case Study on Kerala Floods"(PDF). International Journal of Current Engineering and Technology (9): 26–31. Retrieved 26 October 2021.
^"Dengue/DHF Situation in India". National Vector Borne Disease Control Programme. Ministry of Health & Family Welfare, Government of India. Retrieved 31 October 2021.
