"Heeding my request, the central government has declared the floods (and resultant) damage as Calamity of Severe Nature," she said in a statement here.
The Centre's announcement came after she made made a plea to Prime Minister Narendra Modi here last week, seeking that the floods be declared as "National Disaster," she said.
She recalled she had held detailed discussions with Modi about the torrential rains and the subsequent deluge after he undertook an aerial survey of Chennai and its neighbourhoods on December 3, 2015.
Approval letters in this regard could be sent to the Union Ministry of Statistics and Programme Implementation, she said, citing the circular.
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She had directed state Chief Secretary K Gnanadesikan to apprise MPs of the required renovation and rehabilitation efforts in flood-ravaged districts of Tamil Nadu, the CM said.
Jayalalithaa said she had asked her party MPs to contribute Rs one crore from their MPLADS for this purpose.
The Chief Minister recalled that the northeast monsoon, which brings the bulk of Tamil Nadu's annual rainfall, had set in late by October-end.
However, heavy rains filled up reservoirs and lakes, following which excess water was discharged into rivers even as Chennai, Kancheepuram, Tiruvallore and Cuddalore were badly hit, she pointed out.