| Summary: | Because of the process of rapid urbanization in China, the urban waterlogging problems are becoming more prominent. Reasonable construction of rainstorm security pattern is an important means to realize urban sustainable rainstorm management. Using SCS-CN hydrological model, GIS hydrological analysis module and GIS spatial coupling method, we evaluated the safety space of the watershed, determined the spatial positioning of the inundated area, and finally constructed the rainstorm security pattern network of “runoff corridor + inundation area“. Selecting Zhengzhou City as the research object, the study extracts an evaluation index and the numerical stimulation of the Rainstorm Security Pattern. According to the level of flood risk, all spatial areas of Zhengzhou City are divided into safety areas, low-risk areas, medium risk areas, high-risk areas and extremely high-risk areas. From the perspective of land use strategy, we determined the development intensity and prevention and control measures corresponding to the land space with different flood risk levels.
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