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Recently, urban inundation disasters resulting from torrential rain have led to serious problems in many countries worldwide. To mitigate the damage of urban inundation, various structural strategies have been carried out, one of which is the creation of underground storage chambers attached to sewerage systems. In this strategy, part of the storm water within a sewer pipe is diverted over the side weir into the storage chamber. The function of this storage chamber is to manage the storm water runoff at a developed site to prevent flooding, and it is essential for providing a temporary storage area for excess storm water. In this study, the differences in the effects of the storage chamber using an urban inundation model due to several conditions such as the rainfall type, changes in the weir shape, installation locations that have different areal features, and changes in the storage capacity volume are verified. Lastly, a suitable installation site is verified via assessments of the inundation damage costs. The results show that the criteria for the degree of mitigation that can be expected in these conditions. [ABSTRACT FROM AUTHOR]