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Tidal flood has been an inevitable coastal hazard for some water-front cities in Indonesia, especially in Java Island. Besides Jakarta – the Capital City, Pekalongan City in the North Coast of Central Java is one of the cities suffered. This paper aims to study the effectiveness of coastal dyke in reducing inundation in Pekalongan City using a numerical hydrodynamic model. The model is performed using Delft-3D equipped with spatial data provided by The Indonesian Agency for Geospatial Information. The model is validated against the observed tidal elevation and shows a good agreement. In the validated model, land subsidence and sea level rise are applied. Also, three scenarios of dyke elevation are studied and simulated in 2020, 2030, and 2050. The results presented are the maximum flood depth and the area inundated per scenario.