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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 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."
These photos show the affected areas as people evacuated flooded streets and sought shelter. The storm weakened to a Category One on Friday but continued to sweep its way across Georgia, NBC News ...
Southeast Texas has been hit with heavy rains and rising rivers, leading to school closings, high-water rescues and mandatory evacuation orders in some areas. Here's a look at the situation ...
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, [53] 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]
Hurricane Milton slammed into Florida's Gulf Coast Wednesday night, packing 120 mph winds as a Category 3 storm and bringing a new wave of destruction to an area already reeling from the ravages ...
To prevent the danger of flash flooding and increase the potential for recharging groundwater, a dam was built in 2001 on the Wadi Safad, a 17-meter-high dam, with a reservoir of 0.072 km 2 (0.028 sq mi) and a capacity of 0.26 million cubic meters, called Wadi Safad Dam (12A) (coordinates: 25°13′16″N, 56°17′54″E).