Egypt is probably worried about a repeat of the salinization of the delta as happened when Aswan went up.
The Aswan High Dam was a source of considerable controversy during its construction, and since it began operation it has continued to have its critics. Opponents have charged that silt-free water flowing below the dam has caused erosion of the downstream barrages and bridge foundations; that the loss of silt downstream has caused coastal erosion in the delta; that the overall reduction in the flow of the Nile resulting from the construction of the dam has caused the inundation of the lower reaches of the river by saltwater from the Mediterranean Sea, with resulting deposition of salt in the delta soils; and that the creation of Lake Nasser has caused the water table along the river to rise, resulting in waterlogging and an increase in soil salinity in some areas. Already the fish population offshore of the delta has been reduced dramatically by the loss of the nutrient-laden silt. Proponents of the dam have maintained that these harmful effects are worth the security of dependable water and power supplies, and, indeed, Egypt would have suffered a severe water shortage in 1984–88 without the dam.
Egypt is probably worried about a repeat of the salinization of the delta as happened when Aswan went up.
>The Aswan High Dam was a source of considerable controversy during its construction, and since it began operation it has continued to have its critics. Opponents have charged that silt-free water flowing below the dam has caused erosion of the downstream barrages and bridge foundations; that the loss of silt downstream has caused coastal erosion in the delta; that the overall reduction in the flow of the Nile resulting from the construction of the dam has caused the inundation of the lower reaches of the river by saltwater from the Mediterranean Sea, with resulting deposition of salt in the delta soils; and that the creation of Lake Nasser has caused the water table along the river to rise, resulting in waterlogging and an increase in soil salinity in some areas. Already the fish population offshore of the delta has been reduced dramatically by the loss of the nutrient-laden silt. Proponents of the dam have maintained that these harmful effects are worth the security of dependable water and power supplies, and, indeed, Egypt would have suffered a severe water shortage in 1984–88 without the dam.
https://www.britannica.com/place/Nile-River/Dams-and-reservoirs
Egypt is probably worried about a repeat of the salinization of the delta as happened when Aswan went up.
https://www.britannica.com/place/Nile-River/Dams-and-reservoirs