Ross Mahaffey is a professional engineer at Aurecon, an international group of consulting engineers, where he is the lead 3-D design engineer for pipelines on a large bulk water transfer system in South Africa. He is a civil engineering graduate from the University of Pretoria and has a postgraduate degree in water resource engineering. He may be reached at ross.mahaffey@aurecongroup.com. Stefanus Johannes van Vuuren holds an MBA and Ph.D. in engineering from the University of Pretoria. He has worked with the Department of Water Affairs, Windhoek Municipality, consulting engineering firms, contractors and international academic institutions. He may be reached at fanie-vanvuuren@up.ac.za.