The sanskrit stone inscription of King Purnavarman is of special interest because it preserves the record of river-works executed in the middle of the fifth century.

The Tugu inscription was written in Pallava script, arranged in the form of Sanskrit Sloka with Anustubh metrum, consisting of five lines that run around the surface of the stone.

The inscription was made during the 22nd year of his reign, to commemorate the completion of the canals of the Gomati and Candrabhaga rivers.

On the inscription there is an image of a staff crowned with Trisula straight to mark the separation between the beginning and the end of each sentence.

pura rajadhirajena guruna pinabahuna khata khyatam purim prapya candrabhagarnnavam yayau// pravarddhamane dvavingsad vatsare sri gunau jasa narendradhvajabhutena srimata purnavarmmana// prarabhya phalguna mase khata krsnastami tithau caitra sukla trayodasyam dinais siddhaikavingsakaih ayata satsahasrena dhanusamsasatena ca dvavingsena nadi ramya gomati nirmalodaka// pitamahasya rajarser vvidaryya sibiravanim brahmanair ggo sahasrena prayati krtadaksina// "Long ago, the river named Candrabhaga had been dug by a noble Maharaja that have strong and tight arms, Purnawarman, to channel (water) flow to the sea, after the canal flow by his famous royal palace.