Sunday, November 25, 2012

The Okavango, Okavango Delta (2)

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A characteristic of the Delta is its annual flood.

The Okavango, which rises in Angola, brings its bounty of heavy rains to Botswana's border.

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The swollen river breaches its low-water banks and begin the annual inundation of its floodplains.

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No twoo floods are ever the same, but one can say that the permanent Delta is some 6,000 km2 in extent, while a big flood may cover as much as 13,000 km2.

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At Muhembo, where the Okavango enters Botswana, the flood begins from November as water levels rise.

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Peak flood levels are not reached until the following February or March, and it can take six months for the flood to work its way through the labyrinth of channels and lagoons to reach Maun.

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There, it refills the Thamalakane River, which drains the area and takes the remainder to the Boteti and Lake Rivers.

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