What were the sources of irrigation in the chola period?

The Chola rule witnessed the prosperity of trade and commerce. Income through agriculture yield, land tax, trade tax and other taxes were main revenue of the Government. King was the owner of all public land. Special officers were appointed to look into the income and expenditure of the state. Government money was spent on public works, defense, justice, education, temples, irrigation, police, king and his households, secretariat etc., The Chola kings issued gold, silver and copper coins. Merchant guilds were functioning to take care for the welfare of the merchants and commerce. The Chola economy mainly depended on agriculture and trade. Agriculture was the main occupation of the people. The ownership of the land had a high social value. The landlords were members of the village administrative units. Generally the economic condition of the people during the Chola period was good.