A multi-phase project involving analysis of the interruption of littoral drift due to a new coastal outfall, physical modelling, numerical modelling and options appraisal. Following physical testing, the study reproduced the natural sediment transport mechanisms at the Sandy Street outfall in a numerical model, which will be used to test design options for improving sand transport around the outfall head. This used the XBeach morphodynamic model, which was calibrated against six accumulation events, which was nested within a large-scale Moreton Bay tide and wave model.