Joan Mwihaki Nyika is a Lecturer and researcher at the Technical University of Kenya and a Postdoctoral Research Fellow at the University of Johannesburg. Her current position involves carrying out research on hydro-biogeochemistry and integrated land and water management. Megersa Olumana Dinka is a Professor at the Department of Civil Engineering Science in the University of Johannesburg. His current position involves carrying out research on hydrology, hydraulics, watershed and water management aspects.