In the wake of severe flooding events along the Yangtze River in 2020, which led to casualties and widespread displacement, the city of Jiujiang encountered formidable challenges associated with urbanization-induced overflow and waterlogging incidents. In response, the China Three Gorges Corporation commissioned the Shanghai Investigation, Design & Research Institute (SIDRI) to devise a hydraulic analysis system capable of simulating diverse water conditions in Jiujiang, aimed at bolstering flood preparedness. However, the endeavor faced a substantial obstacle due to the paucity of detailed data concerning the city's flood control and drainage systems.