English: According to the illustration of the present “Kaveri-Kallanai Project”, as is, the Original River Kaveri that is branched off at Mellanai from the present Kollidam River, is only a high level canal, now being called as River Kaveri. Present “Kollidam River”, from Mellanai, which in reality is the continuation of the “Original River Kaveri”, since it possesses entire characteristics of a naturally formed River. This New Kaveri River water is carried up to a point where it is further branched off into “new Kaveri River” and “Vennaru River”. However, On the immediate upstream of this diversion and on the left bank of the “new Kaveri River”, Kallanai was constructed by King Karikalan in order to drain the excessive flood water during the monsoon season over its surplus weir. The water thus drained is subsequently merged back to the “present Kollidam River” (which in fact should have been the “Original Kaveri River”), through an another canal called “Ullaru”.