Aswan Dam assumption did not take into account the extent of perennial irrigation that was already present throughout Egypt decades before the high dam closure. By the 1950s only a small proportion of Upper Egypt had not been converted from basin (low transmission) to perennial (high transmission) irrigation. Expansion of perennial irrigation systems in Egypt did not depend on the high dam. In fact, within 15 years of the high dam closure there was solid evidence that biharzia was declining in Upper Egypt. S. haematobium has since disappeared altogether. Suggested reasons for this include improvements in irrigation practice. In the Nile Delta,
Aswan Dam Though the Czech arms deal actually increased the American willingness to invest at Aswan, Great Britain cited the deal as a reason for reversing its promise of funds. What angered Dulles much more was Nasser's diplomatic recognition of China, which was in direct conflict with Dulles's policy of containment. There are several other reasons why the U.S. decided to withdraw its offer of funding. Dulles believed that the USSR would not fulfill its commitment to help the Egyptians. He was also irritated by Nasser's neutrality and attempts to play both sides of the Cold War. At the time, other western