Dr Koos Vivier has been an Environmental Hydrogeologist since 1999 and is a specialist advisor to Exigo. He has a Doctorate in Environmental Management and a Master’s Degree in Hydrogeology. He specializes in environmental decision-making, numerical and statistical groundwater flow and mass transport modelling, resource quantification, surfacewater–groundwater interaction, mine dewatering, mine water management and the development of water management strategies. He has international experience with projects and workshops done amongst others in Europe, Botswana, Sierra Leone, Algeria, DRC, Kenya, Tanzania, Malawi, Zambia, Namibia, Mozambique and the USA. Dr Koos Vivier also acts as a reviewer for Water SA scientific water publications.