1. School of Agricultural, Earth and Environmental Sciences, Center for Water Resources Research, University of KwaZulu Natal, Pietermaritzburg, South Africa
2. School of Geography and the Environment, University of Oxford, Oxford, UK
3. UNICEF, Zimbabwe Avenue, Maputo, Mozambique, East and Southern Africa
4. British Geological Survey, Edinburgh, UK
5. Department of Geography, University College London, London, UK