Zambezi the overflow of the Zambezi in the rainy season. The delta of the Zambezi is today about half as broad as it was before the construction of the Kariba and Cahora Bassa dams controlled the seasonal variations in the flow rate of the river. Before the dams were built seasonal flooding of the Zambezi had quite a different impact on the ecosystems of the delta from today as it brought nutritious fresh water down to the Indian Ocean coastal wetlands. The lower Zambezi experienced a small flood surge early in the dry season as rain in the Gwembe catchment and
Zambezi Escarpment south of Lake Cahora Bassa. Again, the floor of the rift valley is quite flat here providing a marked contrast to the escarpment. Zambezi Escarpment Zambezi Escarpment is a name used for the escarpments forming both sides of the rift valley or graben in which lie the middle Zambezi river and Lake Kariba. They are fault scarps, rising 500 to 600 m higher than the lake or river, running from the Batoka Gorge roughly 800 km to the lower Zambezi, and facing each other about 50 to 100 km apart, closer in the west and opening up in the east.