Using client data, a numerical modelling study of the reservoir conditions was carried out in MIKE 11 and MIKE 21C. The data was analysed, synthesised and validated, as well as corrected before using as input for the study. This ensured that results from the study were an accurate assessment of actual conditions of the reservoir. Our modelling helped to assess the loss of reservoir storage over time, determine the time taken to reach equilibrium level, identify the optimal flushing strategy as well as highlight the necessity of a separate desilting basin.