Overall Green alert Flood
in Australia

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: 1100794
Deaths: 2
Displaced: 40400
Region: Scenic Rim Regional
Countries: Australia
From - To 16 Mar - 24 Mar
Known identifiers for this event:


For more info on GDACS alert score click here.

Impact Assessement as of 25-03-2021

SENDAI Indicator A N Country Location Info
death 1 Australia Scenic Rim Regional
death 1 Australia Greater Western Sydney
SENDAI Indicator B N Country Location Info
affected 1 Australia -
affected 5 Australia -
affected 15 Australia Greater Western Sydney
affected 1 Australia Hunter Region
affected 15 Australia Mid North Coast
affected 11700 Australia New South Wales
displaced 40000 Australia New South Wales
displaced 100 Australia The Gemfields
displaced 300 Australia Scenic Rim Regional
rescued 1 Australia The Gemfields
rescued 2 Australia Scenic Rim Regional
rescued 700 Australia Sydney, Mid-Coast Council

Satellite Observation


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 0 deaths and 100 displaced 16 Mar 2021 18 Mar 2021 FloodList
2 1 deaths and 300 displaced 22 Mar 2021 24 Mar 2021 FloodList
3 1 deaths and 40000 displaced 18 Mar 2021 22 Mar 2021 FloodList

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.