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eWISA
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NGOTWANE:
MAIN INDEX |
ALPHABETICAL
LIST OF RIVERS |
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Map
of the NGOTWANE River |
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HYDROLOGY
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The Ngotwane River and
its major tributary the Bonwapitse River rise in a range of low
sandstone hills at the edge of the Kalahari Desert to the southwest of
the Botswana capital, Gaborone, and north of Gaborone, respectively.
The
Ngotwane
River
flows in a north-easterly direction to join the
Limpopo
River
some 50 kilometres downstream of the confluence of the Marico and
Crocodile rivers, near Steenbokpan.
The
Bonwapitse
River
also flows in a north-easterly direction, joining the
Limpopo
River
some 60 kilometres downstream of the Ngotwane-Limpopo confluence. (Ref
1)
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The
Ngotwane
River
is dammed near
Gaborone
(Gaborone Dam) and provides the main source of domestic and industrial
water for the city.
Several small farm dams and numerous boreholes provide water for
small-scale irrigation and stock watering in several parts of this
sub-catchment. (Ref 1)
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GEOHYDROLOGY
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All towns and settlements
rely on whatever surface water they can obtain from local streams and
rivers, as well as an extensive system of boreholes.
Gaborone
obtains a large proportion of its water from the
Gaborone
dam, supplemented by water transferred from the Marico Dam in
South Africa
, and the North-South Pipeline that brings water to
Gaborone
from the Motloutse sub-catchment to the north.
Towns located along the route followed by the North-South
Pipeline obtain their water from this pipeline and local boreholes. Most
irrigation water use is based on water pumped from local boreholes. (Ref
1)
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The
Botswana Department of Water Affairs (
Gaborone
office and Mahalapye office) is responsible for management of all water
resources in this sub-catchment.
Close liaison is maintained with the South African Department of
Water Affairs and Forestry over water transferred from the Marico Dam
and regarding flows in the
Limpopo
River
, by means of a Joint Permanent Technical Commission (JPTC).
Both countries collaborate in the gauging of river flows and
exchange of water quality and flow data.
Routine flow gauging is carried out at two stations on the
Ngotwane
River
and at one station on the
Bonwapitse
River
(Boroto & Görgens, 1999) (Ref 1)
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References |
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Ref 1: MMSD
southern
Africa
Research Topic 4: Impacts of Mining and Minerals Processing on
the Biophysical Environment in
Southern Africa
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