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The southern African “green season” started normally with rains
in November - without any hint of what was to hit us a few months
later.
It's usual for the Okavango - Chobe - Zambezi water systems to
see dramatic changes from December to July each year.
The Okavango sees the first of the new season's floods from the
Angolan catchment area. It often takes about 6 months for
the waters to finally reach the southern delta.
The Chobe usually swells during February and the peak of the
Zambezi flood passes over Victoria Falls between April and
May.
In January this year the rafting companies started an early
“high water” season, Namibians reported ongoing heavy rains and the
Angolan catchment area was receiving steady rains. Rains were
fair in February then March was extraordinary!
With unusually high Indian Ocean temperatures, a low pressure
system over central Botswana, Zimbabwe and Zambia and the ITCZ
(inter tropical convergence zone) moving south the Zambezi catchment
was dumped with 120% above average rainfall.

Images from NASA taken at the end of January and end of March
show how both the Chobe and Okavango in particular had
swollen. The Chobe/Zambezi confluence in this second image
appears wider than Lake Kariba at it's widest across the Sengwa
Basin!
During April Chris Worden was on hand in
Botswana to witness water being pushed from the Zambezi back up the
Chobe river.
He reported that the Selinda Spillway was also full.
There’s a chance that the Savute Marsh (dry since 1984) could be
re-established this season. [see Chris’s full report on the
flooding of the Okavango Delta ]
Local heavy rains have since added to the mix to produce the
highest flood on the upper Zambezi since 1969.
Downstream at Victoria Falls the river is still in full spate.
Further downstream, Liz Ferreira reports from our Kariba office
that Lake Kariba is rising rapidly (2m in 10 days) and that the
rains which usually end in April have continued well into May.
There’s a very good chance that the Kariba flood gates will open
in June.
Liz reports autumn chills in the evening but day time
temperatures at 26 degrees, clear blue skies and spectacular
sunsets.
On the lower Zambezi the canoeing and walking season
is about to start – the grass is thick and the pans are still quite
full so it’ll be a while before the big herds of elephant and
buffalo move down to the Zambezi shoreline.
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