INUNDATION FLOW ANALYSIS IN URBAN AREA CONSIDERING BRANCH SEWER EFFECT

Abstract

To make the detailed inundation flow analysis in urban area, a sewer model has an important role. In this study, the slot model is used in the sewer network model, and the sewer pipes whose diameter is over 300mm are treated. As for the inundation flow in the ground, the 2-D inundation flow model by unstructured meshes is used. The inundation water exchange between the ground and the sewer system is treated in detail. The above combined model was applied to Tsurumachi drainage basin in Osaka city. Through the analysis, it was found that drainage process is expressed in more detail than it was, and branch sewer pipes have a large effect on drainage.