الفهرس 
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Abstract
cm. ’the 16il?: of Illq 1964. ooursing Of ’the Nile River on ’th. ’bo~ of the High Dam trO!J1 eas__ 1;0 west took plaee. and in October. the SEWlO yeu, 9.5 D:1illiard n? of water wu alrea~ stored upstream the deJa. with an l.”1oreue of 4 mill-
iard m3 oVer the storage eapa~ty of Aswan Dam (1). The
following table shows the progress of storage;
Year ,6mount of Stored Water in milliard of
eubio meters
19~ 9.5
1965 11.5
1965 1;.5
1967 beg1ning Of stor1ng the entire volume
of t1oo4 water to fill the reservoir.
The .tored water in f:-ont of the High Dam fol1l’1S a large artificial lal’=f:t, 500 Km. long, with en average width of 10 Km”, forming a water 8u.rfa~. of about 5000 ’Q..Xms. and is eonsidered the seoond largest man-made lake. The highest level
of storage in L~e Nasser will reach 18} ms. The maximum oapa.ci ty of stored water amoWlts to 164 m1Uiard .’, of which }Omilliard m’ for the aocumu.lation of silt along 700 years.
The hydraulic conditions through Lake Nasser. the effect of storage, and ’tho controlled discharge of water needed for a
irrigation through out ’the year, resuliied in the ~eharge
of water with much less suspended’1oad and minjmUJn seasonal variatiol’l.. Most of the coarse suspended load settles in Lake Nasser, releasing water with turbidi ties almost lying within the colloidal range. The sharp seasonal variation in the suspended load have disappeared Fig. 1. Such uniformity in suspended load, with less gradation and much more reduction 1n particle size needs more carefull handling and more effective chemicaJ. and mechanical treatment in water purification works (2,3). In addition, algea and different aquatic lite prevailing under such climatic conditions of immense heat and light during storage in Aswan area, would intensify the problem. Algal load, decayed vegitation and re&idues of aQ.uatic deterioration, pres~nt new difficulties during the course of