Submitted by inexister t3_11dyv29 in askscience
SasquatchFingers t1_jae7fnk wrote
I will add to the voices with no stated expertise.
When I visited Rome and asked about it, I was told at the Basilica di San Clemente al Laterano that the primary cause was frequent flooding on the Tiber, with some historical floods dumping as much as a meter of sediment in places.
inexister OP t1_jaebr52 wrote
Another good addition to the myriad of causes being mentioned. I can see how that might cause someone to abandon their humble abode.
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