I found some other stories about this place and history.
Scientists write that the place was really agriculturally rich between 100BC and 400AD (especially after 100AD), but an El Nino event trashed the place with a massive flood at or before 500AD, ruining irrigation systems and forests.
They write that human deforestation made the place much more vulnerable to flood damage (but obviously didn’t cause the flood).
To: SunkenCiv
I found some other stories about this place and history.
Scientists write that the place was really agriculturally rich between 100BC and 400AD (especially after 100AD), but an El Nino event trashed the place with a massive flood at or before 500AD, ruining irrigation systems and forests.
..........
On this there was one haltingly sad story that showed up five to ten years ago in National Geographic or Archaeological Digest. Archaeologists found the bodies of hundreds of high caste people on the top of a pyramid in Peru that dated to about 500 AD. They all had their heads bashed in and their throats cut. The events date to a large el nino and the manner of their deaths suggests they were sacrificed.
One can see the locals endlessly bashing in the heads of their nobles in a desperate attempt to stop the rains.
/bingo