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Assessment of waterlogging hazard in Tianhe District of Guangzhou City using remote sensing and GIS

In recent years, as expansion of city size and urban population, waterlogging has become more frequently in Guangzhou. It has seriously affected people's routine life. In this study, an urban waterlogging model based on SCS (Soil Conservation Service) model and the GIS was built and was applied to assess hazard risk of waterlogging in Tianhe District of Guangzhou, China. It consists of three parts: urban terrain model, urban rainfall-runoff model and GIS spatial analysis model. Rainfall data of most frequent rainstorms in 2010 of Tianhe District were used in our model to assess the risk of waterlogging hazard. Our results show that the risky areas are almost located in southern region of Tianhe District, where located most of commercial and residential populations. Some risky areas are located in central region and few risky areas are located in the northern region. The modeling results consist with the reported real situation, which validated our methods.