Computer modelling of the Milang groundwater basin was done to evaluate the groundwater flow systems of the basin, to test the basin hydrogeology described by Waterhouse et al. (1978), and to derive a groundwater management strategy for this area. The data from the cited report was modelled using the AFPM (Aquifer Flow through Porous Media) modelling package, developed by Golder & Associates for the E. &. W.S. Department. Refinements to aquifer geometry and hydraulic parameters were done in three stages, and pre-pumping steady state hydraulic solutions were derived. Pumping rates based on estimates from Waterhouse et al. (1978) and on estimates of irrigation requirements, according to mapped land use, were applied to a fourth modelling stage. Computed water levels did not show good agreement with observed water levels. The modelling has revealed areas where further research and field tests may supply data which will enable a more accurate model to be constructed. The current model was unable to simulate known drawdown or to compute cones of depression similar to those observed. Reasons for the model failure include: the lack of data on aquifer permeabilities; a lack of knowledge about aquifer geometry and hydrogeology at the basin extremities; and the likelihood that estimates of current pumping rates were possibly too low.