Rapid population increase, industrialization and pollution are putting a strain on available and diminishing freshwater. Recent climate projections suggest a drop of up to 10 % in precipitation in most of Southern Africa by 2050. The simulation results revealed that there will be a reduction of rainfall and water yield. These expected decrease in rainfall coupled with increase in evapotranspiration are going to be the two major drivers in exacerbating the existing problem of water scarcity.