January–February: The Okavango River drains the summer rainfall from the Angola highlands and the surge flows 1,200 kilometers in approximately one month.
March–June: The waters then spread over the 250 km by 150 km area of the delta over the next four months. The high temperature of the delta causes rapid transpiration and evaporation, resulting in a cycle of rising and falling water levels.
June and August: The flood peaks, during Botswana’s dry winter months, when the delta swells to three times its permanent size, attracting animals from kilometres around and creating one of Africa’s greatest
concentrations of wildlife.
The delta is very flat, with less than 2 metres variation in height across its 15,000 km²