采用SWMM与MIKE FLOOD模型分别对湖北西北部典型山地城市郧县老城区的排水管网运行状况进行模拟，分析溢流点及内涝区分布，评估内涝风险状况，结果显示城区内涝情况严重。根据模拟结果，厘清内涝原因，在绿色雨水基础设施的基础上，采用灰色雨水基础设施，提升该区域的排水防涝能力，确保郧县老城区在城镇化进程中排水防涝的安全性。通过MIKE FLOOD模型对工程方案进行校核，证实了工程方案具有可行性。

Simulation of the drainage network operation in Yunxian as a typical mountainous city in northwestern Hubei was conducted using MIKE FLOOD and SWMM model, the distribution of flood points and waterlogging areas was analyzed，and the risk of waterlogging was assessed. And the result showed serious city waterlogging. The reasons for waterlogging were clarified based on the simulation results. Then based on the green storm water infrastructure，gray rainwater infrastructure was used to enhance the drainage and flood control capacity in the region，ensuring the security of Yunxian old town drainage and flood control in the process of urbanization. In conclusion, MIKE FLOOD model was used for verification of the engineering program，proving the feasibility of the engineering project.