الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
At he early stages of communities
development, the magnitude and the complexity of water resources management and environmental problems was not complex. The population was relatively small and water was plentiful
Circumstances have changed very dramatically with the time. Urbanization as well as
industrialization
caused many environmental
problems. Industries were often established close
to rivers or water bodies because of the
capability of discharging industrial wastes into water without additional operation cost. Municipalities also discharged their wastes into
nearest
water body without or after partial
treatment. The problems, any way, were created by human mismanagement.
Mariut lake is one of the four Delta lakes of Egypt (Manzala, Borolous and Idku). All of them are both highly productive at all levels of the food- web and highly diversified in plant and animal species. That, when not misused by man.
is a shallow brackish water body. Its area has been greatly reduced because of projects. It is now divided into basins without any linkage neither with Nile the sea . It is covering a total area 17500 Acres. This area has been during the last years .
basins may be classified as follow:
The main northern basin 6000 Acres. The south eastern basin 7000 Acres. The fish farm 1000 Acres.
The south western basin 3000 Acres.
water in this lake used to be fresh, it was connected to the river, until the when the French expedition came to The English troops drowned the lake in sea to block the French troops passage to Cairo lake has turned from being fresh watered a brackish lake. The lake recieves untreated industrial effluents and agricultural runoff ( from both Eland El- Omoum Drains). Accordingly, Mariut has changed to heavily polluted and highly