Assessment of Inlets Capacity for Inundation Diminution in Urban Watershed

Abstract

Inundation has been highlighted as a major disaster in urban areas due to the emergence of climate change effects on urban hydrology including the deficit of sewer capacity and reduction of delivery and retention times. Furthermore, inundation simulation has been made possible in urban areas because of high resolution topographic data being made available through LiDAR surveys which have provided accurate information on surface conditions. However, recent research on urban inundation has been focused on terrain resolution or building treatment. Although inlets by roads play an important role for draining surface flow, spatial distribution of inlets tends to be neglected in inundation simulations. It is difficult to construct pervious areas in already developed places such as urban areas for disaster management, the spatial distribution of inlets should be considered for the sustainable development of urban areas to avoid inundation disasters. This study aims to investigate the effect of spatial distribution of culverts on urban inundation using Cartesian based terrain as topographical data for a dual-drainage model, and to figure out the proper distribution of culverts combined with pervious distribution areas for a reduction of inundation.