Aswan Dam

The Aswan High Dam, often called simply Aswan Dam, was built between 1960 and 1970 across the Nile in Aswan, Egypt. One of the world's largest embankment dams, it was developed by the Egyptian government with the help of the Soviet Union to control flooding, increase water storage for irrigation, and generate hydroelectricity. The dam was seen as pivotal to the country's industrialization plans. Like the Aswan Low Dam, which had been completed in 1902, the High Dam has changed the economy and culture of Egypt. When the Aswan High Dam was completed, it was the tallest earthen dam in the world, surpassing the Chatuge Dam in the United States. It created the Lake Nasser reservoir. It was built 7 km (4.3 mi) upstream of the Low Dam, which was built in 1902 to regulate the annual flooding of the Nile during late summer. These floods brought high water with natural nutrients and minerals that annually enriched the fertile soil along its floodplain and delta; this predictability had made the Nile valley ideal for farming since ancient times. However, this natural flooding varied, since high-water years could destroy the whole crop, while low-water years could create widespread drought and consequently famine. The Low Dam's relatively small capacity meant water continued to pass largely unimpeded down the valley from its East African drainage basin, so floods and droughts continued. As Egypt's population grew and technology increased, the desire and the ability developed to completely control the flooding, and thus both protect and support farmland and its economically important cotton crop. With the greatly increased reservoir storage provided by the High Aswan Dam, the floods could be controlled and the water could be stored for later release over multiple years. The Aswan Dam was designed by Nikolai Aleksandrovich Malyshev of the Moscow-based Hydroproject Institute. Designed for both irrigation and power generation, the dam incorporates a number of features that were relatively new in the 1960s, including a very deep grout curtain below its base. Although the reservoir will eventually silt in, even the most conservative estimates indicate the dam will give at least 200 years of service.

The earliest recorded attempt to build a dam near Aswan was in the 11th century, when the Arab polymath and engineer Ibn al-Haytham (known as Alhazen in the West) was summoned to Egypt by the Fatimid Caliph Al-Hakim bi-Amr Allah to regulate the flooding of the Nile, a task requiring an early attempt at an Aswan Dam. After his field work convinced him of the impracticality of this scheme, and fearing the Caliph's anger, he feigned madness. He was kept under house arrest from 1011 until al-Hakim's death in 1021, during which time he wrote his influential Book of Optics.

The British began construction of the first dam across the Nile in 1898. Construction lasted until 1902 and the dam was opened on 10 December 1902. The project was designed by Sir William Willcocks and involved several eminent engineers, including Sir Benjamin Baker and Sir John Aird, whose firm, John Aird & Co., was the main contractor.

In 1952, the Greek-Egyptian engineer Adrian Daninos began to develop the plan of the new Aswan Dam. Although the Low Dam was almost overtopped in 1946, the government of King Farouk showed no interest in Daninos's plans. Instead the Nile Valley Plan by the British hydrologist Harold Edwin Hurst was favored, which proposed to store water in Sudan and Ethiopia, where evaporation is much lower. The Egyptian position changed completely after the overthrow of the monarchy, led by the Free Officers Movement including Gamal Abdel Nasser. The Free Officers were convinced that the Nile Waters had to be stored in Egypt for political reasons, and within two mont

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