Hi guys. I went to Rome a while ago and some tour guides kept saying that, being surrounded by hills, Old Rome got buried by rain carrying sediment from the hills. So now most ruins are completely buried. How exactly did this take place gradually, though? I understand that after 2000 years that much would build up, but when it started getting noticeable, wouldn't the Romans take steps to stop it? This may be a stupid question and I may be misunderstanding something. I just don't quite see how this process took place.

Edited your to tour. Oops!