The Kallanai Dam's history stretches back to the 2nd century AD, during the reign of the Chola king Karikala Chola. Built primarily to divert the Kaveri River's waters for irrigation, it aimed to prevent flooding and ensure a stable water supply for agriculture. The original structure was a simple, unmortared stone dam. Over the centuries, the dam underwent several renovations and expansions by the British in the 19th century, who added sluice gates and raised the dam's height. These improvements enhanced its efficiency and extended its lifespan. Even today, the Kallanai Dam continues to serve its original purpose, irrigating a substantial portion of the Cauvery delta and showcasing the enduring legacy of ancient Indian engineering.