Hans-Åke Nordström Hans-Åke Nordström Hans-Åke Nordström (born c. 1934) is a Swedish archaeologist and professor at Uppsala University. His work has included excavations in parts of Nubia, submerged since the construction of the Aswan Dam, and the development of the Vienna System for classifying Egyptian pottery. Hans-Åke Nordström was born around 1934. During the 1960s he excavated parts of Nubia, an area between Aswan in Egypt and Khartoum in Sudan, which were submerged following the construction of the Aswan Dam. In 1972 he received his Ph.D., on the basis of his thesis "Ceramic Ecology and Ceramic Technology. Early Nubian Cultures from the
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