Adiperukku is a tamil festival celebrated on the 18th day of the Tamil month of adi. This is the important festival of Cauvery Delta People. They contribute their prayer to the Mother Cauvery. Because water is the important to agriculture and evening in all part of our life. From the historical days , these type of festival was celebrate in Tamil nadu. So, only they create a GHATS in the Cauvery river in all the place like Srirangam, Grand Anicut, Thiruvaiyaru, Kumbakoam, Mailaduthurai and Poombukar.
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The river Cauvery rises in the mountains of Goorg, on the west coast, and, taking a wide-ranging South-westerly direction, it falls into the sea in the distirict of Thanjavur, on the east coast, following a course of about 400 miles Grand Anicut (Kallanai) is perhaps the oldest dam in the world, constructed by the Chola King Karikalan Grand Anicut dam on river Kaveri (1st-2nd Century CE) is one of the oldest water-regulation structures in the world still in use The dam is still in excellent repair, and supplied a model to later engineers
http://www.heritagetown.org/pmonument.html