DMK President M Karunanidhi said his party would support the government's relief and rehabilitation efforts "in this critical situation".
He announced that people affected by floods could contact the DMK headquarters on 044-24320280 or 7810878108.
"Similarly, DMK district officers can also be contacted for assistance," he said in a statement, adding that party workers would whole-heartedly involve themselves in relief work.
As many as 71 persons have lost their lives in rain-related incidents so far in the state since the onset of the North East monsoon in October end.