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eWISA
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OLIFANTS:
MAIN INDEX |
ALPHABETICAL
LIST OF RIVERS |
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Map
of the Olifants River |
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TOPOGRAPHY
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The
Olifants River rises in the Agter Witzenberge, a plateau lying between
the Winterhoek- (on the west) and the Skurweberge (on the east).
The river then flows northward to Visgat, where it enters a
narrow gorge through which it runs for 30 km before emerging into a wide
valley near Keerom.
For the next 100 km the river runs almost north between the
Cedarberg (on the east) and the Olifantsrivierberge and Swartberge (on
the west).
The final section of the Olifants River between Lutzville and the
sea runs between low hills and receives no tributary of importance.
(Ref.1)
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GEOLOGY
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The
Olifants River drains an area comprising quartzitic sandstone and
quartzites of the Table Mountain Group of the Cape Supergroup, hence,
the very clear runoff.(Ref.1)
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The
Doring River (southern parts) drains off sandstones and quartzites of
the Table Mountain Group, Bokkeveld Group shales and Witteberg Group
quartzites and shales, all of which are components of the Cape
Supergroup.
It also drains in the eastern and northern parts, rocks from the
Karoo Supergroup, Dwyka tillites (easily-eroded) and the Ecca Group
shales and sandstones, therefore it contributes largely to the silt
carried down to the Olifants River.(Ref.1)
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SOILS
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In
the estuary, much of the sediment consists of very fine mud, enriched
with organic material from the extensive salt marshes.(Ref.1)
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References |
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Ref.1.
Morant, P.D. (1984) Estuaries of the Cape.
Part ii Synopses of available information on individual systems.
Report No. 26 Olifants (CW 10).
CSIR Research Report 425. 54pp.
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Useful
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