Severe flooding in Gampola followed intense rainfall associated with Cyclone Ditwah. This analysis is based on secondary media reports and presents a structured 5W+H (Who, What, When, Where, Why, and How) overview.

What

On the night of November 27, shortly after 7:30 PM, heavy rainfall triggered severe flooding across low-lying and urban areas of Gampola. Communication disruptions and the scale of the disaster initially made it difficult to confirm casualties.

Who

Residents of Gampola town were significantly affected, especially those living between Kahatapitiya and Kudamake Road near the Gampola Base Hospital. Response efforts involved the Gampola Urban Council, Disaster Management Centre (DMC), police, and district authorities.

When

Heavy rainfall began around 7:00 AM on November 27, 2025. The most severe conditions occurred between November 27 and 29. Floodwaters remained until approximately 5:00 PM on November 30, with gradual improvement by early December.

Where

Flooding affected central Gampola and nearby low-lying areas along tributaries of the Mahaweli River.

  • Gampola Central Bus Stand
  • Gampola Railway Station (fully submerged)
  • Nidahas Mawatha
  • Areas near Gampola Base Hospital

Why

  • The Mahaweli River was already at high capacity due to previous rainfall
  • Kotmale Dam gates were opened to regulate water levels
  • Additional rainfall from Cyclone Ditwah increased runoff
  • Rapid inflow from surrounding highlands exceeded river capacity

How

Gampola, located along the Mahaweli River, experienced rapid flooding due to cumulative inflows. Prior water releases from Kotmale Dam on November 26 combined with additional rainfall from Cyclone Ditwah. Runoff from surrounding areas, including the Ambuluwawa region, quickly entered the river, leading to overflow into urban areas.

Impacts

  • Severe urban flooding
  • Displacement of residents
  • Transport disruptions (road and railway)
  • Damage to infrastructure and homes
  • Reported casualties (initially unclear)

Sources

Conclusion

The Gampola flood highlights the combined impact of extreme rainfall, river overflow, and upstream water management. Strengthening early warning systems and integrated basin management remains critical to reducing future flood risk.