"Dams had not been maintained for 20 years, says Deputy Mayor
Another commentator: “The erosions in the dams in Derna are not new. They have been reported repeatedly, including in scientific journals from 2011 ... No official has paid attention to it"
https://www.aljazeera.com/news/2023/9/12/infrastructure-in-libyas-derna-not-built-to-withstand-storm-deputy-mayor