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| The major River in the B1
sub-drainage region is the Olifants River and its main
tributary the Klein Olifants. The Olifants River
has its origin near Bethal in the South East and its
largest tributary is the Steenkoolspruit. The origin of
the Klein Olifants is near Hendrina and drains the
Eastern part of the sub- region. The main reservoirs in
this region are Witbank Dam (Olifants River) and
Middelburg Dam (Klein Olifants River). The Klein Olifants
River flows into the Olifants River downstream of
Middelburg Dam. The main features of this area are coal mining, power generation, agriculture, industrial development and large residential areas. Intensive water quality monitoring is constantly conducted in the region due to the potential pollution caused by the mentioned features of the drainage region. |
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| B1H005 Olifants River at Wolwekrans | |
| B1H012 Klein Olifants at Middelburg Dam (Upstream of Dam) | |
| B1H015 Klein Olifants at Middelburg Dam (Downstream of Dam) | |
| B1H018 Olifants at Middelkraal | |
| B1H021 Steenkoolspruit at Albion | |
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