S.D. Lynch
Department of Agricultural Engineering University of Natal, P.O. Box 375 Pietermaritzburg, 3200 Republic of South Africa
M.C. Dent
Computing Centre for Water Research University of Natal, P.O. Box 375 Pietermaritzburg, 3200 Republic of South Africa
R.E. Schulze
Department of Agricultural Engineering University of Natal, P.O. Box 375 Pietermaritzburg, 3200 Republic of South Africa