What caused the catastrophic flash flood in Derna, Libya?

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The catastrophic flash flood in Derna, Libya, was primarily caused by hurricane-strength Storm Daniel, exacerbated by the failure of two upstream dams and compounded by the country's poor infrastructure.

The immense surge of water, described as tsunami-sized, not only overwhelmed the city but also led to the catastrophic collapse of two dams situated upstream from Derna late on a Sunday. This dual failure of natural and man-made structures unleashed a devastating torrent that reduced large parts of the port city into an apocalyptic wasteland. Entire neighbourhoods and an unknown number of inhabitants were swept away into the Mediterranean Sea.
Storm Daniel's Intensity and Path

The extreme weather event, identified as hurricane-strength Storm Daniel, had already demonstrated significant destructive power prior to reaching Libya. This storm had gathered considerable strength during an unusually hot summer and had previously caused widespread flooding and fatalities in Turkey, Bulgaria, and Greece. Climate experts have pointed to the disaster as a stark illustration of the escalating impacts associated with a warming planet, highlighting how such storms can intensify under changing climate conditions.
Infrastructure Failures and Warning Systems

The catastrophic impact in Derna was significantly worsened by the nation's dilapidated infrastructure, a consequence of prolonged political turmoil following the 2011 uprising. The failure of the two upstream dams is a critical factor in the scale of the disaster. Furthermore, the effectiveness of early warning and emergency management systems was compromised. Officials noted that with better coordination and functioning warning systems, evacuations could have been carried out, potentially preventing a significant portion of the human casualties.
Devastation and Human Impact

The scale of destruction in Derna is immense, with central neighbourhoods bearing the brunt of the floodwaters. An AFP photographer described the affected areas as resembling a landscape that had been run over by a steamroller, with trees, buildings, and vehicles uprooted and scattered. Survivors recounted the terrifying speed at which the water level rose, with some trapped on upper floors of buildings as floodwaters surged around them. The immediate aftermath saw thousands listed as missing, with hundreds of body bags accumulating in the streets awaiting mass burials, while traumatised residents continued their desperate search for loved ones amidst the mangled remains of their homes.

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What caused the catastrophic flash flood in Derna, Libya?

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