GDACS is a cooperation framework between the United Nations, the European Commission and disaster managers worldwide to improve alerts, information exchange and coordination in the first phase after major sudden-onset disasters.

Overall Green alert Flood
in Madagascarfrom 03 Mar 2012 00:00 UTC to 07 Mar 2012 00:00 UTC
GDACS Event Report - Flood impact



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

  • Duration: 03/03/12 to 07/03/12
  • Impact: 65 killed and 0 displaced

Locations affected:

    • Severity: class 1 (i.e. large flood event with significant damage to structures or agriculture; fatalities; and/or 1-2 decades-long reported interval since the last similar event)

    The alert score is based on the reported death and displaced. Red = 1000 or more people killed or 800000 or more people displaced or international assistance already required. Orange = 100 or more people killed or 80000 or more displaced.

    Satellite observations

    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 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, Resolution of 250m, heavily affected by cloud cover.
    Rain: Rainfall accumulaiton of the past 24h, as detected by the Global Precipitation Measurement mission of NASA. For more information, see

    The time evolution of all layers since the first day the flood event was recorded, can be seen by dragging the slider under the satellite map.

    Timeline of revisions

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

    IDAlert ColorPopulation affectedSourceDate added
    1 65 killed and 0 displaced DFO 01 Jan 1900 00:00
    249 65 killed and 0 displaced DFO 24 Sep 2012 16:52
    2 65 killed and 0 displaced DFO 05 Jun 2013 16:46

    More information

    Data resources

    For a full list of available products related to this event, please refer to the GDACS Data Resources page.

    About the data

    Information related to the flood has been collected from official and media reports by the Dartmouth Flood Observatory.


    While we try everything to ensure accuracy, this information is purely indicative and should not be used for any decision making without alternate sources of information. The JRC is not responsible for any damage or loss resulting from the use of the information presented on this website.