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The Wadi Derna is a river valley in Libya which leads down from the Jebel Akhdar mountains to the port city of Derna. Like many other wadis in North Africa, it is an intermittent riverbed that for much of its length contains water only when heavy rain occurs. [1] It is 75 kilometres (47 mi) long [2] and drains a drainage basin of 575 km 2.
However, Derna is near the fertile upland area of eastern Libya, which is the wettest region in the country, receiving some 600 millimetres (24 in) of precipitation annually. [citation needed] The city is built along the Wadi Derna, an ephemeral river that is dry much of the year.
The Derna dam is 75 meters (246 feet) high with a storage capacity of 18 million cubic meters (4.76 billion gallons). The second dam, Mansour, is 45 meters (148 feet) high with a capacity of 1.5 ...
The Derna dam collapses were the catastrophic failures of two dams in Derna, Libya, on the night of 10–11 September 2023, in the aftermath of Storm Daniel.The collapse of the Derna Dam and the Abu Mansour Dam released an estimated 30 million cubic meters (39 million cubic yards) of water, [6] [7] causing flooding downstream as the Wadi Derna overflowed its banks.
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Batujai Dam, Lombok, West Nusa Tenggara; Batutegi Dam, Tanggamus, Lampung; Bili-Bili Dam, Gowa, South Sulawesi; Cacaban Dam, Tegal, Central Java; Cirata Dam ...
The Mansour (or Abu Mansour [83]) dam had a water storage capacity of 1.5 million cubic meters, while the Derna (or Belad [83]) dam upstream had a capacity of 22.5 million cubic meters [83] (1.5 million cubic meters by another source [80]). Floods in Libya, most of the additional rainfall from the storm fell outside Wadi Derna's basin