Confirmed deaths
564+
7 events have no verified toll
Within 25 km of a reservoir
10 of 12
Measured distances from the source study
Closest event
6.0 km
Thindillam, from Mangalam dam
Adoormala (Kudayathoor) and Vagamon, with Payyanithottam (Poonjar)
Idukki / Kottayam · 1 August 2026
Fresh torrential downpours under red-alert conditions triggered slope failures at Adoormala (Kudayathoor) and Vagamon in Idukki and at Payyanithottam (Poonjar) in Kottayam.
- Deaths
- 3
- Rainfall at trigger
- Not verified
- Nearest reservoir
- Idukki · 22.8 km
Measured in source study
- Coordinates
- 9.6867, 76.9058
Approximate
At least 3 deaths across the three sites
Sources & verification
- • Reservoir-induced landslides in Kerala (compiled study, 2026)
Punchirimattom, Mundakkai, Chooralmala and Vellarimala (Meppadi panchayat, Vythiri taluk)
Wayanad · 30 July 2024
The deadliest landslide disaster in Kerala's history. A debris flow originating on Punchirimattom hill swept through Mundakkai and Chooralmala into the Chaliyar. GSI's post-event report classed the four affected areas as a Moderate Susceptibility Zone with highly susceptible slopes above them.
- Deaths
- 420
- Rainfall at trigger
- 572 mm
48 hours to 30 July 2024, at the epicentre
- Nearest reservoir
- Karapuzha · 13.5 km
Measured in source study
- Second reservoir
- Banasura Sagar · 29.3 km
- Coordinates
- 11.4707, 76.1300
Settlement-level
Over 420 deaths, with hundreds injured and many still missing
Sources & verification
- • Reservoir-induced landslides in Kerala (compiled study, 2026)
- • Onmanorama, 30 July 2024 — 572 mm in 48 hours at the epicentre
- • GSI post-event report, August 2024 (via The News Minute)
- • Rainfall: IMD rain-gauge data as reported by Onmanorama, 30 July 2024
Marmala / Teekoy hills
Kottayam · 2022
Slope failure in the Marmala–Teekoy high range, recorded in the reservoir-induced landslide study for its proximity to the Idukki reservoir rim.
- Deaths
- Not verified
- Rainfall at trigger
- Not verified
- Nearest reservoir
- Idukki · 18.6 km
Measured in source study
- Coordinates
- 9.7311, 76.7789
Approximate
Casualty figure not verified
Sources & verification
- • Reservoir-induced landslides in Kerala (compiled study, 2026)
Kanichar, near Kottiyoor
Kannur · 2022
Hill-slope failure in the Kanichar–Kelakam belt of the Bavali/Valapattanam catchment, upstream of the Pazhassi barrage.
- Deaths
- Not verified
- Rainfall at trigger
- Not verified
- Nearest reservoir
- Pazhassi · 20.1 km
Measured in source study
- Coordinates
- 11.9053, 75.7751
Approximate
Casualty figure not verified
Sources & verification
- • Reservoir-induced landslides in Kerala (compiled study, 2026)
Poovanchi and Kavali, Koottickal
Kottayam (with impacts in Idukki) · 16 October 2021
Torrential October monsoon rain produced multiple debris flows around Koottickal and Kokkayar, destroying houses along the Manimala headwaters.
- Deaths
- 26
- Rainfall at trigger
- Not verified
- Nearest reservoir
- Idukki · 22.6 km
Measured in source study
- Coordinates
- 9.5650, 76.8830
Settlement-level
At least 26 deaths across multiple incidents
Sources & verification
- • Reservoir-induced landslides in Kerala (compiled study, 2026)
Perunad
Pathanamthitta · 2021
Slope failure in the Perunad hills of the Pamba catchment, recorded in the study at 42.9 km from the Idukki reservoir.
- Deaths
- Not verified
- Rainfall at trigger
- Not verified
- Nearest reservoir
- Idukki · 42.9 km
Measured in source study
- Coordinates
- 9.3722, 76.8686
Approximate
Casualty figure not verified
Sources & verification
- • Reservoir-induced landslides in Kerala (compiled study, 2026)
Neyyattinkara–Neyyar Dam corridor
Thiruvananthapuram · 2021
Slope instability recorded downstream of the Neyyar dam, 16.7 km from the reservoir along the Neyyar valley.
- Deaths
- Not verified
- Rainfall at trigger
- Not verified
- Nearest reservoir
- Neyyar · 16.7 km
Measured in source study
- Coordinates
- 8.4022, 77.0847
Approximate
Casualty figure not verified
Sources & verification
- • Reservoir-induced landslides in Kerala (compiled study, 2026)
Kalletumkara–Kodaly belt
Thrissur · 2021
Ground failure recorded in the Chalakudy–Kalletumkara lowland belt, 23.2 km west of the Chimmini reservoir.
- Deaths
- Not verified
- Rainfall at trigger
- Not verified
- Nearest reservoir
- Chimmini · 23.2 km
Measured in source study
- Coordinates
- 10.3311, 76.2896
Approximate
Casualty figure not verified
Sources & verification
- • Reservoir-induced landslides in Kerala (compiled study, 2026)
Thindillam / Nannangadipara
Palakkad · 2021
The closest event in the study to a reservoir: a slope failure only 6.0 km from the Mangalam dam, on the same hill flank that drains into the reservoir.
- Deaths
- Not verified
- Rainfall at trigger
- Not verified
- Nearest reservoir
- Mangalam · 6.0 km
Measured in source study
- Coordinates
- 10.5058, 76.4747
Approximate
Casualty figure not verified
Sources & verification
- • Reservoir-induced landslides in Kerala (compiled study, 2026)
Pettimudi, near Rajamala, Kanan Devan Hills
Idukki · 6 August 2020
A massive hill collapse above the Kanan Devan Hills plantation buried the labour quarters at Pettimudi at night. One of the highest single-site death tolls in Kerala before 2024.
- Deaths
- 65
- Rainfall at trigger
- Not verified
- Nearest reservoir
- Idukki · 31.7 km
Measured in source study
- Coordinates
- 10.1897, 77.0311
Settlement-level
65 deaths — tea-estate workers' layams buried while occupants slept
Sources & verification
- • Reservoir-induced landslides in Kerala (compiled study, 2026)
Puthumala
Wayanad · August 2019
A major mudslip above Meppadi, 5 km from the site later destroyed in 2024. GSI subsequently classed the area as a high-susceptibility zone.
- Deaths
- Not verified
- Rainfall at trigger
- Not verified
- Nearest reservoir
- Karapuzha · 13.1 km
Measured in source study
- Coordinates
- 11.4936, 76.1289
Settlement-level
Part of a combined toll of over 100 deaths with Kavalappara
Sources & verification
- • Reservoir-induced landslides in Kerala (compiled study, 2026)
- • The Hindu, 31 July 2024 (Puthumala susceptibility classification)
Kavalappara, Pothukal
Malappuram · August 2019
An entire hillside collapsed onto a residential pocket at Kavalappara during the 2019 monsoon, alongside widespread regional flooding.
- Deaths
- 50
- Rainfall at trigger
- Not verified
- Nearest reservoir
- Karapuzha · 22.4 km
Measured in source study
- Coordinates
- 11.2367, 76.3128
Settlement-level
Over 50 fatalities at Kavalappara alone; over 100 combined with Puthumala
Sources & verification
- • Reservoir-induced landslides in Kerala (compiled study, 2026)
Sources & limits
Primary source: the compiled study Reservoir-induced landslides in Kerala, which measures each event's straight-line distance to the nearest large reservoir. Rainfall and casualty figures are cross-checked against news and government reporting where available and left blank otherwise.
Coordinates are settlement-level (±1–2 km), not survey-grade scarp positions. Distance to a reservoir is a spatial association only — it is not, by itself, evidence that reservoir operation caused a landslide.
Reservoir levels, releases and rainfall for the same locations are on the dashboard.
