Abstract
We propose a revised inundation flow model for urban areas in which storage effects of ditches are incorporated into stormwater drainage and overflow processes. Ditches are assumed to be on both sides of every street. Simulations were performed for two cases, i.e., considering and not considering ditches, and a significant difference was observed between the results for the two cases. However, the simulation results obtained by including the volume capacity of ditches in the volume of stormwater drainage boxes in the authors’ conventional model are almost the same as the results obtained using our revised model. Consequently, while the volume of ditches has a significant effect on the inundation results, the stormwater drainage process can be simplified in the simulation model.
