In the Roman period, Pliny, the governor of Bithynia, covered a canal and used it as the main drainage system in the city of Amastris. These new forms of water-bringing got rid of some the ancient ways of using wells and cisterns, but wells and cisterns were still used a great deal as a source of water. The world has adopted thIs great invention of public works and have modified it with technology, making it better suit the people's needs. Who would have begun a system of public works if the Greeks did not? Would the world's knowledge be where it is?