Overall Green alert Flood for Sri Lanka
in Sri Lanka

Flood impact summary

Flood Sri Lanka is expected to have a low humanitarian impact based on the magnitude and the affected population and their vulnerability.

GDACS ID: 1100608
Deaths: 1
Displaced: 458
Region: North Western Province, Western Province, Gampaha District, Colombo District, Puttalam District
Countries: Sri Lanka
From - To 05 Sep - 14 Sep
Known identifiers for this event:

GDACS Score

For more info on GDACS alert score click here.

Impact Assessement as of 05-09-2020

SENDAI Indicator A N Country Location Info
death 1 Sri Lanka Gampaha District
SENDAI Indicator B N Country Location Info
affected 7000 Sri Lanka Colombo District
affected 2000 Sri Lanka Puttalam District
affected 30000 Sri Lanka Gampaha District
displaced 458 Sri Lanka Gampaha District

Satellite Observation

Satellite-based Flood extent provided by GLOFAS
Overall of the satellite-based flooded area from / to : 2020-08-29 / 2020-09-21  

Saturday 29/08Sunday 30/08Monday 31/08Tuesday 01/09Wednesday 02/09Thursday 03/09Friday 04/09Saturday 05/09Sunday 06/09Monday 07/09Tuesday 08/09Wednesday 09/09Thursday 10/09Friday 11/09Saturday 12/09Sunday 13/09Monday 14/09Tuesday 15/09Wednesday 16/09Thursday 17/09Friday 18/09Saturday 19/09Sunday 20/09Monday 21/09

Timeline of revisions

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

IDAlert ColorPopulation affectedStart DateEnd DateSource
1 1 deaths and 458 displaced 05 Sep 2020 14 Sep 2020 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.