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6 - To gain acceptance, the new dynasties took on new titles and performed religious rituals to become a part of the Kshatriyas. ... The new dynasties also engaged themselves in warfare to assert their power and carve kingdoms for themselves.
7 - The irrigation works developed in the Tamil region were – wells, tanks to collect rainwater and river channels
6. The new dynasties gained power and wealth. Thereafter they declared themselves to be maha-samantas or mahamandaleshwara. Many of such kings adopted high sounding titles like maharaja-adhiraja or tribhuvana-chakravartin. They also deputed learned brahmanas to depict them as valiant, victorious warriors. Their activities were recorded in Prashastis. They tried to demonstrate their power and resources by building large temples.
7. During fifth or sixth century the area of Tamil Nadu was opened up for large-scale cultivation. For irrigation, a variety of new methods were discovered. In, many areas wells were dug. Huge tanks were constructed for rainwater storage.