The Bar Beach problem is a textbook example of an ongoing beach erosion caused by the virtually complete cutoff of alongshore sediment transport. Although various interim and ‘ad-hoc’ solutions have been put in place over the past 40 years, the problem has reached a stage that a permanent solution to the continuing erosion problem is required. This paper outlines engineering investigations carried out to derive a permanent and sustainable solution to the beach erosion problem at Bar Beach, focussing on the numerical modelling studies.