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Virtually all of
the tributaries and the main river will probably only have surface flows
after substantial rain. The
Buffels
River
, itself, has very erratic flow and only reaches the sea during flood
events, every 3 to 5 years. There two reasons
for this, namely because the major part of the catchment lies in a
low-rainfall-area (100 – 200 mm mean annual rainfall)and the
geological formation of the river basin forms two large aquifers, which
absorb much of the river flow. The
high water table and the low salinity of the groundwater, however,
suggest that subterranean flow occurs.
(Ref 1)
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