<Li> The granite columns from the Faras Cathedral </Li> <Li> A part of the paintings of the Faras Cathedral; the other part is in the National Museum of Warsaw . </Li> <P> The remaining archaeological sites, including the Buhen fort or the cemetery of Fadrus have been flooded by Lake Nasser . </P> <P> Before the construction of the High Dam, the Nile deposited sediments of various particle size--consisting of fine sand, silt and clay--on fields in Upper Egypt through its annual flood, contributing to soil fertility . However, the nutrient value of the sediment has often been overestimated. 88 percent of the sediment was carried to the sea before the construction of the High Dam . The nutrient value added to the land by the sediment was only 6,000 tons of potash, 7,000 tons of phosphorus pentoxide and 17,000 tons of nitrogen . These amounts are insignificant compared to what is needed to reach the yields achieved today in Egypt's irrigation . Also, the annual spread of sediment due to the Nile floods occurred along the banks of the Nile . Areas far from the river which never received the Nile floods before are now being irrigated . </P>

How did farming on the nile change after the aswan high dam was built