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Mozambique:
What to see |
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Lake
Cahora Bassa
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>see photographs
Overview
The Barragem de Cahora Bassa dams the Zambezi River approximately
150 km northwest of Tete. The lake pushes back to the confluence of
the Zambezi and the Luangwa Rivers on the border with Zambia. This
is one of the largest civil engineering projects of its time in Africa
and although the dam is not as large as Lake Kariba it has better
electricity producing capacity. The setting and surrounding scenery
is beautiful.
History
The local government of the Portuguese province of Mozambique identified
a need to be able to control the flooding of the Zambezi, and to store
water for agricultural and industrial projects planned for the Lower
Zambezi Valley. The concept of producing hydroelectric power was introduced
after thoughts of agriculture and industry, and the turning point
was South Africa agreeing to buy all the power produced thus justifying
building the massive hydroelectric power producing plant.
The site was decided on in 1960 but the dam was only built in the
early seventies and was subject to attacks by Renamo rebels even during
the building process. In 1974 the building was completed and the lake
started filling.
Problems encountered
The first problem, and the most crippling, was the destruction of
the power lines to South Africa and other parts of Mozambique by Renamo
rebels in 1986. Basically for the fist twenty years after it was constructed
the Cahora Bassa Hydroelectric Power Plant produced electricity at
nowhere near its capacity.
The invasion of the water hyacinth has also caused major concern -
this species was introduced to Africa from South America and has caused
large problems in Lake Kariba, Lake Victoria, and other African lakes.
Growing at a remarkable rate this plant has drastic effects on the
aquatic life. This is because it increases the rate of evaporation
of water, it consumes a great deal of oxygen from the water, and it
covers a great deal of the surface area of the lake. It is also practically
impossible to eliminate since its seeds fall to the bottom of the
lake where it is very difficult to gather and destroy them.
The third concern is the build up of silt in the dam - this could
affect the efficiency of the plant. Although Lakes Kariba and Kafue
stop a lot of the silt in the Zambezi River the Luangwa River has
been carrying increased volumes of silt in previous years. The reason
being that poor farming methods in the surrounding areas have resulted
in overgrazing and thus increased erosion and run off of soil into
the Luangwa River.
Repair and Rehabilitation
Contractual obligations of the South African company ESKOM have forced
them to restore the power project of Cahora Bassa. This involved the
construction of the lines to South Africa along a new route since
there were landmines under the old lines.
Zimbabwe and South Africa are now both supplied by the Cahora Bassa
as well as the local area in Mozambique.
Statistics of the Lake and Project
| Length
of the lake |
270
km |
| Area |
2
660 km2 |
| Catchment
Area |
1
200 000 km2 |
| Capacity |
52,000
million cubic metres |
| Average
inflow |
2,800
cubic meters per second (cumecs) |
| Flood
inflow |
above
30,000 cumecs |
| Wall
height |
160
metres |
| Dam
Crest |
Altitude
331 metres |
| Wall
Type |
Double
curved concrete arch |
| Generating
Potential |
4,000
megawatts |
(Source of this information: Damit by Henry Olivier)
When To Go
The cooler drier months of April to September. Being in the Zambezi
Valley the Lake can be humid and temperatures soar up in the high
30's C (100 F) during the rainy season November to March. Temperatures
rarely drop below 25 C (76 F) during the cooler months.
Accommodation
The Ugezi Tiger
Lodge is right on the lakeshore and its name derived from its
excellent Tiger fishing opportunities offered on the Lake.
How to get there
By road
On the road to Zimbabwe 24 km from Tete is the turn off to Songo (which
is the dams' service town) and the access road to the lakeside. The
road is paved and in fine condition and provides a very scenic route.
There are also daily buses to Songo leaving from the Hotel Kassuende
in Tete.
Permits
Before arriving at the Lake one needs to obtain written permission
from one of the H.C.B offices (Hidroelectricia Cahora Bassa), which
can be found in Tete, Chimoio, Maputo, Harare and Johannesburg. These
are presented to the police at a checkpoint before the town.
Tours
Guided Tours of the Dam including the underground turbine rooms can
be arranged and run a few times a week. These can be arranged by contacting
H.C.B Maputo at 1132 Av. do Trabalho, Tel: (01) 400647, Fax: (01)
400551, Telex: 6-467
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