The frequent urbanization and extreme rainfall events have posed the threat to the urban environment. The implementation of low impact development (LID) practices with great potential for control urban flood and overflow pollution is not comprehensively understood yet due to the influence of complex factors (i.e., hydrological pattern, installation location, and vertical parameter setting). In this study, the hydraulic and water quality model were used to analyze the hydrological and pollution reduction of outfall and storage under different hydrological patterns, vertical parameter setting, and green infrastructure installation locations, which can determine the best implementation of the scheme for overflow pollution control. The results showed that nine parameters of the vertical layer regarding the four parameters impacted the peak value and load of suspended solids (SS). The combination scheme of the LID practices was further proposed based on the selection and analysis of the single LID practice. Besides, considering the installation location, the downstream installed location was a better choice. The horizontal connection of overflow runoff and pollution could be reduced by up to 9.75% and 36.46%, respectively. In addition, the horizontal connection can effectively reduce the peak value of inflow and pollutants at the time of assessing storage tank impact, which reach the maximum of 14.08% and 29.25%, respectively. The pollutants distribution became uniform and showed better resilience against rainfall intensity, which is beneficial to the management of stormwater. Our findings can provide guidance for Sponge City construction and effectively alleviate the combined sewer overflow.

频繁的城市化和极端降雨事件对城市环境构成了威胁。由于受复杂因素（即水文格局、安装位置和垂直参数设置）的影响，在控制城市洪水和溢流污染方面具有巨大潜力的低影响开发（LID）实践的实施尚未得到全面了解。本研究利用水力和水质模型分析了不同水文格局、垂直参数设置、绿色基础设施安装位置下排污口和蓄水池的水文和污染减少情况，从而确定溢流污染方案的最佳实施方案。控制。结果表明，垂直层的四个参数中的九个参数影响了悬浮固体（SS）的峰值和负载。在对单一LID实践的选择和分析的基础上，进一步提出了LID实践的组合方案。此外，考虑到安装位置，下游安装位置是更好的选择。溢流径流和污染的横向联系可分别减少9.75%和36.46%。此外，横向连接可有效降低储罐冲击评估时的流入量和污染物峰值，最大值分别达到14.08%和29.25%。污染物分布趋于均匀，对降雨强度表现出更好的弹性，这有利于雨水的管理。研究结果可为海绵城市建设提供指导，有效缓解合流下水道溢流。