Abstract
Urban flooding is increasingly pervasive, with the decreasing water area in cities and the dreadful impact on people. Therefore, it is necessary to carry out a quantitative evaluation of the area of urban water and analyze the threshold of the reasonable water ratio under different drainage scenarios. In this research, simulations were performed by using the Personal Computer Storm Water Management Model (PCSWMM), and the model parameter calibration method was based on the runoff coefficient as a contribution to meeting the data-poor urban areas. Then, urban flood control standards were divided into four classes, and the rainfall scenario once in 200 years and historical maximum were selected to build future extreme inundation scenarios in the case study. Simultaneously, methods for the reasonable water area ratio estimation were decided. The cost-effectiveness of all possible solutions was examined across the two scenarios based on the assessment method. The results show that the range of reasonable ratios of the water area under traditional planning is 5.78–6.02% to meet the standard of urban drainage. Similarly, the range of reasonable ratios of water area under the LID (low impact development) plan combined with the sponge city concept is 5.63–5.88%.
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Data availability statement
The data that support the findings of this study are available from the authors, including data used and model results, which can be seen in the following links https://pan.bnu.edu.cn/l/b1kNHC (no password).
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Acknowledgement
This research was funded by the National Natural Science Foundation of China (52070023), National Key Research and Development Program (2017YFC0404505) and the National Water Pollution Control and Treatment Science and Technology Major Project (2017ZX07301-001). We would like to extend special thanks to the editor and the anonymous reviewers for their valuable comments in greatly improving the quality of this research.
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Bu, J., Peng, C., Li, C. et al. A method for determining reasonable water area ratio based on flood risk and cost-effectiveness in Rainy City. Environ Earth Sci 79, 450 (2020). https://doi.org/10.1007/s12665-020-09201-1
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DOI: https://doi.org/10.1007/s12665-020-09201-1