Negative Impacts_aswan Dam

8/16/2019 Negative Impacts_aswan Dam

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Negative impacts

CASE STUDY : ASWAN HIGH DAM


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AFTER EFFECTS!!!


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SILTING


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fow regulation:

Before : 600 - 13 000 m3/s, and

Now: 700 - 2800 m3/s.

Water released to the Mediterranean sed to !e a!ot 32 "m3mean annall# and is now limited to a!ot 300 million m3.

$he Nile sed to trans%ort 90& of ss%ended matter

drin' the (ood season.

)nnal *+$ )M)$+N : 134 million tons

stimated sedimentation drin' esi'n : 60 million m3annall#4.

onsiderin' the a!o5e fat dead stora'e of a%ait# of31 km3 alloated for life s%an500 #rs4


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Contd… Lack o silt replenishment de to the elimination of

annal (oods. $his has led farmers to rel# on chemicalertilisers to maintain the fertilit# of a'riltral land. $here has also !een a h'e inrease in the %rie of soil!ease the silt was also sed for ma"in' building bricksand, e5en tho'h it was made ille'al to sell soil to rede

erosion, farmers freentl# t and sell soil !ri"s.

No (oodin'----no fertile soil----no a9ote nitro'en rihntrients4 ---armers resort to e;%ensi5e fertili9ers.4


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Water table Problem…

$o std# the nder'rond water re'ime, pieometers andobser!ation wells installed.


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Weed growth


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$he irri'ated land in '#%t is a!ot %"& millionacres"

$he anal s#stem of irri'ation and draina'e totalsa!ot 50 000 km.

)fter onstrtion of dam W %o%lationincreased.

'()*+, : water released from the )swan


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SEISMIC ACTIVITY

$he sr%rise orrene in No5em!er 1A81 ofmoderate eartha"es of ma'nitde 5"3 Ms,a!ot 55 "m soth-west of the


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OTHER PROBLEMS

isheries were aHeted in a wa# . *ardines an aati s%eies has almost disa%%earedde to na5aila!ilit# of tr!id water.

Iro%a'ation of *2*.+*+2)*(*-whih

stands ne;t to e%idemi Malaria . *alinit# and Water lo''in' Iro!lems..

*ee%a'e of water into soilJele5ated Waterta!le le5el ..

Iro!lem of dereased Bearin' a%ait# Monments in tro!le.

$he sared tem%le of )! *im!el and man#other monments were arefll# transferredto ele5ated area .


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the entire Structure RELOCATED!!


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Negative Impacts_aswan Dam

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