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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.
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.
The total length of the Wadi Hadf is 27 km (17 mi), of which 13 km (8.1 mi) run in Omani territory and 14 km (8.7 mi) in Emirati territory.Its river source is located at an approximate altitude of 1,130 m (3,710 ft), on the northwest slope and a very short distance from the summit of Jabal Hatta, [6] also known as Um Alnosoor (1,280 m (4,200 ft)).
Alternative names: Wādī Sharm, Wadi Sharam, Ghalīlat Da'ān The name and cartographic references of Wadi Sharm (with the spelling Wadi Sharam) were recorded in the documentation and maps produced between 1950 and 1960 by the British Arabist, cartographer, military officer and diplomat Julian F. Walker, during the work carried out to establish borders between the then called Trucial States ...
The Doña Ana County Flood Commission in the U.S. state of New Mexico defines an arroyo as "a watercourse that conducts an intermittent or ephemeral flow, providing primary drainage for an area of land of 40 acres (160,000 m 2) or larger; or a watercourse which would be expected to flow in excess of one hundred cubic feet per second as the result of a 100 year storm event."
Floods in Libya, most of the additional rainfall from the storm fell outside Wadi Derna's basin. The two dams sustained major damage in a storm in 1986, [54] and cracks were reported in both structures in 1998. [84] Derna's deputy mayor said that the dams had not been maintained since 2002 and were not built to withstand such volumes of water. [85]
Map shows path of cyclone Chido (Mateo France) Hundreds of poor people living in shacks with sheet metal roofs were hit especially hard as the storm tore up many of their homes.
Alternative names: Wādī Şafad, Wadi Safad In the National Atlas of the United Arab Emirates it appears with the spelling Wādī Şafad. [2]The name and cartographic references of Wadi Safad were recorded in the documentation and maps produced between 1950 and 1960 by the British Arabist, cartographer, military officer and diplomat Julian F. Walker, during the work carried out to establish ...
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