Regulation of Rainwater in Quyuan Park Using the SWMM: A Case of Changde City, China

This study focuses on Quyuan Park in Changde City, Hunan Province, China, and compares two development scenarios: one without a sponge facility and one with a combined sponge facility. The SWMM model was used to simulate total runoff, peak flow, and peak time under 2-hour rainfall events with recurrence periods of 1 year, 3 years, 5 years, and 10 years. The results demonstrate that the SWMM model can accurately quantify the runoff reduction performance of various sponge facilities, providing a reliable theoretical foundation and data support for addressing urban stormwater management challenges. The findings highlight the significant advantages of sponge facilities in reducing runoff and delaying flood peaks, particularly in controlling peak flow and extending the peak occurrence time. This study offers valuable data and insights for advancing the application of sponge city strategies to mitigate urban flooding.