Dam of Chefa
NGINEERING surveys for the Cheia
trees characterizing the agrological composition
E
dam
were
undertaken
in
19Q7
,
featuring the nature of lands crossed by different
construction works started in 1960 and
wadis and at the degree of alleviation of each
the commissioning was in 1965. the
depression.
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considerable increase on the population of Annaba
Th
Ch ff
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and the important industrial development With El—
en
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12 kam ISÊÎÊ
e up ofT}îhe mainddam
and
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Had3ar steel complex required the construction of
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this dam on the Chefa Site (Bounamoussa wad1)
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În Epst1ea1n}uate1t1glitiiess clay
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50 kilometers from Annaba.
na
1s 51
m
ng
,
650 m ong
vs1t1 a capac1ty
of 170 million cubic meters and average annual
Laying out on a surface of 2600 square kilometers,
contributions of 140 million cubic meters/
the Mafragh basin forms the side of the last
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section of the northern cham of the Telhan Atlas
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made up of the Medjera mounts running alongs1de
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The
foundation
includes
two
types of
5011
the Mediterranean coast on 70 kilometers. ln
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30—m
au
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wa er 1
i ness
Mafragh basm, two wad1s ow, Bounamoussa m
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.rimar
screen was ma
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ow
ressure.
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the West and Kéb1r wad1 in the East. Kéb1r wad1’s
È d
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oo
wa er
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wa
IS
a
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won m
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source
IS
the peak of Koud1at Ben Ahmed and
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connec e
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Bouhadjer wad1, Which form Bounamoussa wad1.
g
y g
g
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and downstream, an energy clear1ng basm was
oods feed the plain at the bottom of
provided. Its disposal capacity is 1200 cubic meters
Annaba and El—Kala chain to form a large marsh.
per second. In case of exceptional ood water, El
Precipitations vary between 1600 millimeters and
Kerma dyke can serve as an auxiliary spillway.
650 millimeters. The avera e annual run—off is 14«0
_
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.
.
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g
.
Cheñia dam in the Wilaya (provmce) of El—Tarf 18
million cubic meters and the regulanzed volume
_
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_
.
.
.
the most important source of dr1nk1ng water
reaches 95 million cubic meters.
_
_
_
_
supply in the Wilaya (provmce) of Annaba With 35
Between the Eastern chains and those of the West
million cubic meters. lt provides the latter with
bordering the Seybouse valley, Annaba’s great
80% of water resources both for its population’s
depression lies, at an average
altitude of
340
needs and for its industrial units.
meters. This depression between Annaba and El
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_
_
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,
,
.
This dam plays an important role in the ecolog1cal
Kala IS scattered With marshes (M Krada, birds
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.
;
balance of this region,
scattered With hunnd areas
‘
lake, Oube1ra lake).
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.
and therefore With exceptional fauna and ora.
All this area offers a diversied vegetal cover of
cork oak trees, zen oak trees, ash trees and elm
_