Why model rainfall measured by radar in space-time?
Increasing demands are being made on our meagre water resources and because there is greater population pressure causing invasion of high-risk flood-prone areas, there is an increased need for more detailed information about the spatial and temporal distribution of rainfall to assist with flood warning and mitigation. In general the purpose of modelling is two-fold: to summarise complex physical processes in a descriptive or mathematical way with as few parameters as possible (parsimony) and to gain as deep an understanding of the phenomena as is possible, relevant and cost effective under the circumstances (insight). The reason for modelling the rainfall process is to provide as much parsimony and insight as is reasonable, so that possible future scenarios can be artificially generated to conduct what-if investigations. Because of the relatively recent advent of remote sensing of rainfall in South Africa, the radar-records are quite short (3 to 5 years) and do not provide, in themselv
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