The Ugly American and the Soviets struggled for preeminence in the Third World through proxies in Latin America, Africa, and Asia. In the Middle East, the US feared the spread of Communism starting in Egypt and attempted to secure the region's most populous and politically powerful country for the West by guarantees of funding for construction of the Aswan Dam but it was eventually the Soviets who prevailed. Soviet diplomatic and political successes in the Third World left the West worried about losing one country after another to Communism according to the domino theory evoked by President Dwight D. Eisenhower. It was in
Aswan Dam year. The annual crop consumptive use of water is about . Hence, the overall irrigation efficiency is 38/46 = 0.82 or 82%. This is a relatively-high irrigation efficiency. The field irrigation efficiencies are much less, but the losses are reused downstream. This continuous reuse accounts for the high overall efficiency. The following table shows that the equal distribution of irrigation water over the branch canals taking off from the one main irrigation canal, the Mansuriya Canal near Giza, leaves much to be desired: The salt concentration of the water in the Aswan reservoir is about , a very low salinity