<![CDATA[The Sungai Kakap District in West Kalimantan is highly vulnerable to tidal flooding (rob) because of its low-lying coastal environment. Accurate mapping of flood extent is crucial for supporting disaster risk reduction and mitigation planning. This study applied water level data combined with a Digital Elevation Model (DEM) processed using the Simple Bathtub Model to map tidal flood extent during the December 2024 event. The generated flood maps were further analyzed to assess their impact on infrastructure and population exposure. The validation results demonstrated that the model achieved an overall accuracy of 0.74 and a Kappa coefficient of 0.43, indicating that the Simple Bathtub Model provides a reasonably reliable representation of tidal flood extent. The analysis indicated that the December 2024 flood inundated approximately 150,000 m of road networks, submerged between 900 and 1,000 buildings, and affected an estimated 16,000 to 17,000 residents. These findings highlight the high vulnerability of low-lying coastal communities in West Kalimantan and demonstrate the value of adopting simple yet effective modeling approaches as practical tools for disaster risk reduction, mitigation planning, and long-term coastal resilience.]]>
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