In Botswana, the rate of evaporation over open water
surfaces is high because the country is characterised by hot and semi
arid climatic conditions. The purpose of the study is to investigate the
correlation between Botswana's monthly maximum temperature and
evaporation and between monthly maximum wind speed and
evaporation, for the stations Gaborone, Francistown and Maun and to fit
transfer function-noise models between the highly correlated elements.
The data were obtained from the Botswana Department of
Meteorological Services. Cross correlation analysis revealed that for the
selected weather stations, monthly maximum evaporation is much more
strongly correlated to monthly maximum temperature than to monthly
maximum wind speed. Monthly maximum temperature and evaporation
were modelled with transfer function-noise models. The results of the
study are crucial mainly to those in water management, agriculture and
other similar industries

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