DEVELOPING AN URBAN INUNDATION SIMULATION MODEL BY CONSIDERING STORM WATER INFRASTRUCTURES

The climate change issue is dramatically risen by developing of urbanization. This matter of change resulted in more frequent flooding and inundation problems in the urban areas. The urban flood inundation modeling act as an efficient way to rapidly address these challenges by helping disaster managers. This paper introduces a new simulation model of urban storm-inundation. The proposed method uses commonly available input data to estimate the conditions of inundation quickly. The method is based on hydrologic models and geographic information systems. The effects of storm water infrastructures were also considered in inundation calculation. Terrain depressions are regarded as initial inundated area. The amount of surface runoff, the maximum storage volume, the flow direction and the water flow order between these depressions are all considered in the final inundation simulation. A part of region 22 of Tehran was chosen as study area. The results revealed that the proposed method could find inundation locations in the urban area. It can also calculate inundation depth and its volume while considering the effects of storm water infrastructures. A comparison of our proposed model with the USISM showed that the simulated amount of total volume and total depth in our methodology are reduced about 9.13 and 7.12 percent respectively. The lack of consideration of the effects of land-use type and stormwater infrastructures in USISM model is attributed to this difference. The proposed method can be used to create forcasting system for disaster management of flood inundation and helps managers reduce the effects of stormwater disasters.