The Nile delta Lakes (fig. 1) are shallow, brackish water bodies with a depth
ranged from 50 to 180 cm. The area of the Lakes Edku, Borollus and Manzala reached
about 115, 370 and 700 km2
, respectively. Lake Edku is a subject to huge inputs of
terrigenous and anthropogenic nutrients discharge, sewage and agricultural runoff (2.06
X 109
y-1) via three main drains, Edku, El-Boseily and Barzik situated at its eastern
margins drains. Lake Borollus receives mainly agriculture drainage water (3.2 X 109
m3y-1) from six drains at its southern region. Lake Manzala receives annually about 6.7 X
109
m3 of raw sewage, agricultural and industrial wastewater. The three Lakes are
connected with the sea through an open namely El-Boughaz at their northern regions.