Ecological optimal layout method of rainwater accumulation pipe network in Sponge City under the influence of small seepage

Under the influence of small seepage, a proposed solution to effectively address the problem of rainwater regulation and storage in Sponge City and improve water quality, is the ecological optimal layout method of rainwater garden pipe network in Sponge City. To analyze the relationship between rainwater garden and Sponge City, it takes a research area in Ningnan County, Liangshan Prefecture which focuses on two aspects including the ecological plant configuration and filler configuration of the pipe network. The SWMM model is used to simulate the change of run-off before and after the ecological optimal layout of the pipe network, the change of flood peak lag time, the change of rainwater outflow time, and the change of pipeline regulation and storage status, so as to analyze the effect of ecological optimal layout and design the ecological optimal layout plan of rainwater garden pipe network in Sponge City. The results and analysis showed that the ecological optimal layout scheme can improve the storage and water quality of the Sponge City, and provide technical support for the reconstruction of the Sponge City under the influence of small seepage.