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vol-32IMPACTS OF DRAINAGE WATER DISCHARGE ON THE
WATER CHEMISTRY OF LAKE EDKU
LAILA SHAKWEER
National Institute of Oceanography And Fisheries
Keywords: Lake Edku – water chemistry – drainage water – Ecology of lakes.
ABSTRACT
Lake Edku which is considered as important fishing area in Egypt receives its water from
two sources. The main source is the drainage water of Kom Belag and Bersik drains where
it is annually supplied with 1836.55 × 106
m3
of water. The sea water of Abu Qir Bay enters
the lake sometimes through the lake sea connection as subsurface water current under the
action of wind specially in winter. The present study pointed out that the water temperature
of the lake (22.38o
C) was slightly higher than that of the drains average (21.70o
C). The
average values of total dissolved solids were 1.88 and 1.44 g/L in the lake and drainage
water respectively. pH values indicated that both the lake and drainage water were always
on the alkaline side where the average values 8.04 and 7.89 in both respectively. The study
showed that the lake and drainage water were mostly well oxygenated therefore nitrate
compounds dominated the nitrogen species in the water of both. The annual supply of
inorganic nitrogen and phosphorus compounds to the lake through drainage water were
estimated as 1065.62 metric tons of nitrogen and 646.61 metric tons of phosphorus.
