An assessment of spatial and temporal rainfall variability and its implications to Molapo farming in the Okavango Delta, Botswana (original) (raw)

Abstract

This paper assesses the variability of rainfall on the entire Okavango Delta. Due to the effects of climate change as a result of global warming there is a concern of possibility of decline of rainfall over Southren Africa. Rainfall is a very important component driving the hydrological cycle and therefore the understanding of rainfall spatial and temporal variation is crucial for agricultural production and general water resources management. Time series of individual months, continuous month- to month, total rainfall for the early part ofthe rainy season, October-November-December (OND), the mid to end of the rainy season, January-February-March JFM) andannual rainfall, for 16 stations spread on the entire Okavango Delta are analysed and assessed for correlations and any significant trends to proof any changes in rainfall. A homogeneity test was conducted using four different methods; the Standard Normal Homogeneity, the Buishand Range, the Pettit and the Von Neuman ratio to exami...

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