46
into a public garden. Currently Algiers comprise one centered landfill of 95 ha located in the
west of the wilaya in the commune of Mahelma allowing the treatment of household and
similar waste and resulting leachate treatment, and construction waste.
The management of liquid waste is known as urban wastewater. The rate of connection to the
sewerage network of Algiers is 98% allowing the recovery of about 480 thousand m
3
.day
-1
,
treated at four stations (Réghaïa, Baraki, Beni Messous, Staouili), with a treatment capacity of
75%.
2.7. The wilaya of Tipaza
2.7.1. General description
The wilaya of Tipaza is located at about 70 km to the West of the Algiers. The northern side of
the wilaya faces the Mediterranean basin. The wilaya covers an area of 1 707 km², of which more
than 40% is plain, 34% is hills and 20% of mountains (Monographie/Tipaza, 2020). The wilaya
of Tipaza is located in the Algerois sector (figure 4). This wilaya borders on a highly urbanized
region, namely the wilaya of Algiers, and Blida. Hence the high the population, which attracted
by economic (Algiers, Blida), agricultural (Mitidja) and industrial (Blida) activities.
Tipaza comprises 28 municipalities, including 13 coastal municipalities which occupy a total
surface area of approximately 670 km², hosting 57% of the total population of the wilaya with
an increasing surface area from East to the West. The coastal municipalities are marked by a
strong urbanization estimated at 36% of urbanized coastal line at the level in eastern
municipalities (from Tipaza to Douaouda). The municipalities of the western region of Tipaza
are larger (over 70 km²). These municipalities are marked by a low population compared to the
eastern municipalities such Kolea, Fouka, and Hadjout, where the density is 2 to 3 times the
average density of the wilaya. This is explained by the fact that the eastern municipalities such
Bou-Ismaïl are included in the western extension of the wilaya of Algiers, in addition to the
history of the western municipalities of Tipaza, which has prevented the settlement of the
population. Conversly, the western and south-western region of Tipaza (Messelmoune, Larhat,
Aghbal, Beni Milleuk, and Menaceur) comprise a significant natural heritage consisting of a
variety of sites, including forest and recreational gardens, sandy and rocky beaches, the chain of
hills of the Tellian Atlas, and the imposing Mount Chenoua.
In addition to its tourist appeal, the wilaya has strong assets that can captivate and interest the
neighboring population. However, compared to Algiers, its territory remains relatively
unaltered by human activity.
2.7.2. Natural potential of the wilaya
As a result of its location, Tipaza has a Mediterranean climate between sub-arid and humid,
with two bioclimatic trends: a minimum temperature of 9.3°C linked to the topography, the sea
and the vegetation (Khoualdi, 2012), with 675 mm average rainfall, of 79% (445.5 mm)
of
the annual rainfall is recorded from November to April (Monographie/Tipaza, 2014). This
precipitation supplies the wilaya's various water sources, including groundwater, surface water
such Mazafran, El-Hachem, Djer, Damous Ouds, as well as the dams, particularly the
Boukerdene dam in the commune of Sidi Amar with a capacity of 145000m
3
and an approximate
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