Pambaru originates in Kerala and Amaravathi Dam in Tamil Nadu is fed by it and caters to irrigation needs in districts including Karur and Tirupur.
"Tamil Nadu farmers should not be affected. The State and Central governments should take appropriate measures to halt the dam's construction," Ramadoss said in a statement here.
"Kerala, which had stopped the construction of a dam across Pambaru due to opposition from Tamil Nadu has now started construction work suddently," he said.
Pambaru comes under the purview of Cauvery Tribunal and a nod from it must have been obtained before going ahead with the project, he said.
"It tantamount to violation of rules by going ahead with the project without clearances," he added.

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