Aswan Dam in Egypt had to be dredged regularly to remove sediments. After construction of the dam, aquatic weeds grew much faster in the clearer water, helped by fertilizer residues. The total length of the infested waterways was about 27,000 km in the mid-1990s. Weeds have been gradually brought under control by manual, mechanical and biological methods. Mediterranean fishing and brackish water lake fishery declined after the dam was finished because nutrients that flowed down the Nile to the Mediterranean were trapped behind the dam. For example, the sardine catch off the Egyptian coast declined from 18,000 tons in 1962 to a
1969 Aswan Ilyushin Il-18 crash third try when it banked to the right and hit the left side of the runway. The starboard wing tore off and a fuel spillage followed which caused the crashed aircraft to burst into flames. The probable cause was determined to be that the "Pilot descended below the minimum safe altitude without having the runway lights clearly in sight. A contributory factor was fatigue arising from continuous working hours without suitable rest periods." 1969 Aswan Ilyushin Il-18 crash On 20 March 1969, a United Arab Airlines Ilyushin Il-18 crashed while attempting to land at Aswan Airport. 100 of the 105