Party General Secretary K Anbazhagan kicked off the protest at DMK headquarters "Anna Arivalayam" here in which many party cadres participated. Similar fast was being held in other parts of the state. A human chain in five districts receiving water from the dam is scheduled on Wednesday.
Tamil Nadu and Kerala are locked in a row over the dam, with the latter wanting to dismantle the existing structure on safety grounds and construct a new one. Tamil Nadu is stiffly opposed to it, saying the dam was safe.