What are facts about the roman aqueducts?

As roman towns got bigger it became to hard for people to get clean water. Raw sewage was draining into rivers and when people drank river water they got sick or died. Then the government decided to build long stone channels to carry clean water from nearby hills to the towns. These stone channels were called aqueducts. This Word came from the latin Word aqua (water) and ductus (channels). By the time of the empire most roman towns had at least 1 aqueduct. Big cities like Rome had more.