Roman aqueduct

I finally get to see a Roman aqueduct. This one brought water 5 miles to the city of Caesarea on the Mediterranean coast of modern Israel. Herod the Great had his palace there. He also built a deep-water port, a 3,500-4,000 seat theater, and a hippodrome (horse-racing stadium). Plus, the beach is great. Archeologists figure that 35,000 to 40,000 people lived there. How do they figure that? They multiply the capacity of the theater by ten.