A 3D hydrodynamic model has been used to investigate how different wind conditions can affect the upwelling of phosphate in the Gippsland Lakes. Apart from wind speed and wind direction, the study found that changes in wind direction also play a very important role in upwelling of bottom water in the lakes. It has been found that almost half of the phosphate below the euphotic depth could be mixed in to the surface water within 36 hours during an upwelling event.