This study presents the development of a pluvial inundation model for the Oizumi district of Toyama City, which was affected by flooding on August 13, 2022, and quantitatively demonstrated pluvial inundation countermeasures. The analysis results were validated, and the effectiveness of various flood mitigation measures was quantitatively demonstrated through numerical simulations. Our findings show that implementing multiple flood control measures resulted in a comparable reduction in inundation area compared to individual measures in several scenarios. This similarity in effectiveness can be attributed to the significant impact of the most effective measures, which may diminish the added benefit of supplementary measures. Consequently, combining multiple flood control measures, while avoiding redundancy, is recommended for maximizing the reduction of inundation damages.