Overall Green Flood
in Sri Lanka

Flood impact summary

This flood is expected to have a low humanitarian impact based on the magnitude and the affected population and their vulnerability.

GDACS ID: 1104075
Deaths: 12
Displaced: 6882
Region: Central Province, Sri Lanka, Gampola, Hatton
Countries: Sri Lanka
From - To 02 Aug - 04 Aug
Known identifiers for this event:

GDACS Score

For more info on GDACS score click here.

Impact Assessement as of 06-08-2026

SENDAI Indicator A N Country Location Info
death 8 Sri Lanka Sri Lanka
death 4 Sri Lanka Hatton
SENDAI Indicator B N Country Location Info
affected 15412 Sri Lanka Sri Lanka
affected 1512 Sri Lanka Sri Lanka
displaced 3316 Sri Lanka Sri Lanka
displaced 3566 Sri Lanka Sri Lanka
rescued 21 Sri Lanka Gampola
SENDAI Indicator C N Country Location Info
houses damaged 537 Sri Lanka Sri Lanka
houses damaged 129 Sri Lanka Sri Lanka

Satellite Observation

Satellite-based Flood extent provided by GLOFAS
Overall of the satellite-based flooded area from / to : 2026-07-26 / 2026-08-11  

Sunday 26/07Monday 27/07Tuesday 28/07Wednesday 29/07Thursday 30/07Friday 31/07Saturday 01/08Sunday 02/08Monday 03/08Tuesday 04/08Wednesday 05/08Thursday 06/08Friday 07/08Saturday 08/08Sunday 09/08Monday 10/08Tuesday 11/08

Timeline of revisions

For accessing reports of previous advisories, please click on the advisory number in the table below.

IDLevelPopulation affectedStart DateEnd DateSource
1 12 deaths and 6882 displaced 03 Aug 2026 04 Aug 2026 GLOFAS

Flood polygons

This polygon (translucent blue with a blue border) is drawn by the analysts recording the flood event. It is meant to include all the areas reported as affected, by official source or the media. It does not represent the area actually under water.

Microwave flood detection

Flooded area, as detected in microwaves by the Global Flood Detection System of the JRC, based on NASA TRMM/GPM observations. This system has a rather low resolution (of 5-10km) but is not affected by clouds.
For more details, see http://www.unisdr.org/files/9622_LBNA23303ENC002.pdf.
The areas with a flood signal along the coast are an artefact of the system and should not be considered.

Optical Flood detection

Flooded area as detected in optical wavelengths by NASA/MODIS, known as "MODIS Flood Product". Data are made available by NASA GSFC Flood Mapping Project, http://oas.gsfc.nasa.gov/floodmap/index.html. Resolution of 250m, heavily affected by cloud cover.