Effect of Switching Storage on Reducing Flooding in Urban Area

In this study, we quantitatively evaluated the runoff suppression effect of stormwater storage facilities contributing to basin-wide flood management and examined optimal operational methods for these facilities. Focusing on Matsue City, Shimane Prefecture, the study proposes a switching storage operation method, adjusting the storage facility’s operation based on a threshold of 6.75 mm/hr, equivalent to the drainage capacity of the urban area, and synchronizing with the internal water level during inundation events. The results for the July 2006 heavy rainfall event show a peak reduction of approximately 2.6% in the total inundation volume and 3.7% in the urban inundation volume, with a 5.5% reduction in the area of above-floor flooding in urban areas. Furthermore, it was found that the “stormwater storage potential” of the storage facilities contributes to the runoff suppression effect. It is inferred that the runoff suppression effect of the storage facilities can be maximized by performing appropriate operations according to the rainfall pattern and scale.

Recommended citation: Haruki Matsui, Hibiki Kitajima, Kenji Kawaike, Takahiro Koshiba, Kazuki Yamanoi, and Keiko Wada. (2025). "Paper Title Number 1." Journal of JSCE. 81(16).
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