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The West Surabaya area, especially in the lower reaches of Tandes Rayon, has a high level of inundation risk due to several factors, one of which is the influence of sea level rise. Therefore a puddle map is needed which is one of the efforts to minimize the impact of inundation that occurs in the downstream area of Tandes Rayon by using scenario condition, namely inundation scenarios for the downstream condition of Rayon Tandes, and inundation scenario in the event of sea level changes to the global warming. Hydrological data processing can use HEC-HMS software and for hydraulic data processing requires primary channel profile data and can be processed in HEC-RAS 1D. Inundation map modeling in the Lamong bay area uses 2D HEC-RAS which is used to determine flood-prone locations caused by sea level rise in simulated scenarios. The results of this analysis a map of the inundation location that is prone to flooding in the Tandes Rayon area can be obtained and can be used for flood warnings and mitigation. From the inundation map that is produced, it can be seen the inundation area, the height of inundation that occurs, and the length of inundation time.