الفهرس 
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Abstract
Egypt’s northern Delta Lakes are Edku Lake, Burullus Lake, Manzala Lake, and Bardawil Lake have an important natural environmental impact on the area. They are an important carural resource for fish production in Egypt. As these lakes have a great influence on the northern coast of Egypt, a great attention is given to the environmental studies. Collection of data is carried out concerning the quality of the lake water. After analyzing the collected data, it is obvious that the Egyptian Lakes suffer from many croblems as pollution of the aquatic environment that considered a major threat to the aquatic organisms including fish. Lakes receive huge amounts of drainage water which - ntaining pesticides, fertilizers, effluents of industrial activities and agricultural runoffs in addition to sewage effluents which supply the water bodies and sediment with huge euantities of heavy metals and organic matter. The hydrodynamic characteristics of estuaries are investigated and studied by measuring ce affecting factors. Two numerical models are studied, the first one is to study the effect ; tide on the estuaries and the second is to study the effect of waves on the estuaries. The details of these two programs and their flow charts showing the steps of the programs are presented. The results showed that when the flow enters the inlet of the lagoon with a certain velocity, it spreads until reached to limited area and that isn’t enough to make circulation for water in lagoon. Therefore, although the Egyptian Lakes are connected to the sea through inlet channels they are still polluted.