Why did so much technology that was common in the Roman Empire did not make it into the medieval age?

Question

Examples like aquaducts, sewage, advanced architecture, etcetera

In: 121

Answer 1

For most of the Empire, the population of Rome was estimated to be in excess of a million. By 500 AD, the population had dropped to about 80,000. By 1000 AD, the population was 30,000 and the indigent and bandits were squatting in the ruins of the Colosseum. The Eternal City didn’t really recover until the Renaissance.