ASIATODAY.ID, JAKARTA – Devastating floods and landslides once again swept across Sumatra at the end of December 2025 and early January 2026, exposing a long-standing environmental crisis.
While extreme rainfall and tropical systems acted as triggers, analysts warn that decades of deforestation and weak land governance have turned natural hazards into large-scale human disasters.
According to Indonesia’s National Disaster Mitigation Agency (BNPB) as of January 4, 2026, the disaster has claimed 1,117 lives, left 148 people missing, and forced around 242,000 residents to flee their homes. At least 178,479 houses were damaged, ranging from light to total destruction.
Simultaneous Disasters Across Regions
Floods and landslides struck almost simultaneously in multiple provinces. Affected areas include Pidie Jaya, Aceh Tamiang, Bener Meriah, and Bireuen in Aceh; Solok and Agam regencies in West Sumatra; as well as parts of Padang, South Kalimantan, and Central Java.
The pattern was strikingly similar across locations: intense rainfall over a short period, overflowing rivers, and hillsides unable to absorb water. Watersheds that should have functioned as natural buffers instead became channels for mud, debris, and uprooted trees.
Public Anger Focuses on Deforestation
An analysis of 576,176 conversations on Twitter/X and YouTube reveals a dominant narrative among the public: deforestation is seen as the primary factor amplifying the disaster’s impact.
Negative sentiment overwhelmingly framed the floods as a consequence of unchecked exploitation of nature. Many users argued that communities are paying the price for land-use decisions that benefit only a few.
Syamil Iklil, an economist at the Big Data Continuum Research Center – INDEF, said the online discourse reflects growing public awareness of structural environmental risks.
“The public no longer sees these floods as purely natural disasters. There is a strong understanding that forest loss and poor environmental governance significantly magnify the impact of extreme rainfall,” Syamil said in official statement on January 9, 2026.
He added that communities feel trapped in an unjust system, where environmental degradation in upstream areas directly threatens lives downstream.
Extreme Rainfall and the Role of Tropical Cyclone Senyar
Data from BMKG and Statistics Indonesia (BPS) confirm an extraordinary spike in rainfall during the disaster period. In North Aceh, daily rainfall reached 310.8 millimeters, around 180 percent above the long-term average.
According to Arini Astari, a data scientist at Big Data Continuum – INDEF, extreme weather acted as the trigger—but not the root cause.
“Meteorologically, the emergence of Tropical Disturbance 95B, which later intensified into Tropical Cyclone Senyar, significantly enhanced cloud formation and moisture supply,” Arini explained.
“However, the destruction became severe because the land’s natural absorption capacity had already been drastically reduced.”
Forming over the Malacca Strait in late November 2025, Cyclone Senyar intensified rainfall, strong winds, and other extreme weather conditions across northern Sumatra.
Shrinking Forests, Growing Risks
Data from Statistics Indonesia (BPS) show a steady decline in forest cover in several upstream regions. Forest loss weakens soil stability, reduces water infiltration, and accelerates surface runoff—conditions that turn heavy rain into flash floods and landslides.
Arini stressed that under such degraded conditions, disasters become almost inevitable.
“In a degraded landscape, extreme rainfall no longer represents an exceptional event. It becomes a trigger for systemic failure,” she said.
A Wake-Up Call for Policymakers
Taken together, casualty figures, rainfall data, and deforestation trends point to a clear conclusion: Sumatra’s floods are the result of long-term environmental pressure colliding with climate anomalies.
Syamil Iklil emphasized that disaster response must go beyond emergency relief.
“Post-disaster recovery must be accompanied by structural reforms. Without revisiting spatial planning, restoring watersheds, and tightening land-use permits in upstream areas, similar disasters will continue to recur,” he said.
Researchers recommend integrating hydrometeorological risk data and forest-cover indicators into spatial planning, accelerating watershed rehabilitation and reforestation, and strengthening environmental oversight to reduce long-term disaster risk. (AT Network)
Follow Us at Google News and WA Channel