This work relates changes in hydrological inputs, simulated for various possible upstream development and climate change scenarios, to changes in extent, frequency and duration of flooding in the Okavango Delta. It must be emphasised that this assessment deals only with effects related to change in temporal distribution and magnitude of water inputs. The effects of changes such as change in amount of sediment resulting from the considered scenarios are not assessed. Also, changes in the structure of the hydrological system of the Okavango Delta (i.e. permanent flow shifts) are not taken into account. These are potentially much stronger instruments of hydrological change.