1. Department of Plant Production, Soil Science and Agricultural Engineering, University of Limpopo, Polokwane, South Africa
2. Limpopo Department of Agriculture and Rural Development, Polokwane, South Africa
3. Institute for Water Studies, University of the Western Cape, Bellville, South Africa (formerly Water Centre, CSIR, Stellenbosch, South Africa)
4. Risk and Vulnerability Science Centre, University of Limpopo, Polokwane, South Africa