Updated Flood Hazard Atlas for Assam State

Assam is one of the flood prone States in the country. In order to minimise the impact of the floods in the State, Government of Assam approached National Remote Sensing Centre (NRSC), ISRO, Hyderabad for identifying the flood hazard level of various villages in the State.

Satellite images depict the extent of flooding and flood inundated areas can be identified using digital image analysis techniques. Using 215 satellite images acquired during floods of last 18 years (1998-2015), most frequently inundated districts and villages were identified, based on the frequency of inundation. Villages were categorised into five hazard classes as Very High, High, Moderate, Low and Very Low.

An updated ‘Flood Hazard Atlas for Assam State’ was prepared and the maps were validated by the Govt. of Assam through Assam State Disaster Management Authority (ASDMA). The atlas provides information on frequently flooded villages in the State of Assam and also provides the flood hazard severity in different districts based on flood hazard category, flood hazard area and intra-annual flood variations.

About 28.75% (22.54 lakh hectares) of land in Assam State is affected by flood during 1998-2015. It is also observed that 17 out of 34 districts in Assam are severely flood affected.

The atlas was released by Shri Pallab Lochan Das, Hon’ble Minister of State for Revenue & Disaster Management, Government of Assam on September 06, 2016 at Guwahati. Hon’ble Minister appreciated the efforts of NRSC in bringing out the updated atlas for the State of Assam.

Assam is the first State in the country to release satellite based flood hazard atlas in 2011 and also the first State to update the atlas in 2016.

The flood hazard layer is uploaded for detailed viewing in Bhuvan geoportal.

 

Before Floods During Floods
Satellite Images showing the normal and flood conditions at Kaziranga National Park in Assam State. Dark colour indicates water in these Images-Before Floods Satellite Images showing the normal and flood conditions at Kaziranga National Park in Assam State. Dark colour indicates water in these Images-During Floods

Satellite Images showing the normal and flood conditions at Kaziranga National Park in Assam State. Dark colour indicates water in these Images

 

Flood hazard map of Assam (Different colours represent different hazard classes)

Flood hazard map of Assam (Different colours represent different hazard classes)

 

Release of the updated ‘Flood Hazard Atlas for Assam State’ by Shri Pallab Lochan Das, Hon’ble Minister of State for Revenue & Disaster Management, Government of Assam

Release of the updated ‘Flood Hazard Atlas for Assam State’ by Shri Pallab Lochan Das, Hon’ble Minister of State for Revenue & Disaster Management, Government of Assam