the south of Egypt. It is a mesotrophic lake (Mageed and
Heikal, 2006). Lake Nasser is the second largest manmade lake
in Africa, after Lake Volta (Ghana). It is a monomictic subtropical
lake (Heikal and Abdel Bary, 1999) with prevalent
lacustrine properties. The only source of lake water is the River
Nile. The outflow is the continuation of the Nile towards the
north. Lake Nasser is unique in its performance because it is
situated in pure desert. It has an irregular shape with many
embayments called ‘‘Khors’’, 48 lie on the eastern side and
37 on the western one (Entz, 1974). The Nile flood comes once
a year in late August originating from the Ethiopian highlands.
It is known by its high turbidity carrying a heavy load of mud
consisting of a mixture of sand, silt and clay. The yearly flood
of the Nile is the most important factor affecting the conditions
of the reservoir.