Research of Urban Community Road System Layout Optimization Strategy Based on Simulation Analysis of Generation and Concentration

As a major component of hard underlying surfaces in a city, roads in communities are main sources of runoff and important channels for runoff discharge. Therefore, it is of great significance to explore the relationship between community roads with the runoff generation and concentration process, which helps to improve the stormwater management resilience of communities. Taking the communities in Tianjin as examples, this paper further discusses the whole process of runoff generation and concentration in four types of road layouts, which are the square grid type, cul-de-sac type, circular-gird type and circular-cul-de-sac type under different rainfall events by ArcGIS and SWMM software. The results provide useful and reasonable references and suggestions for the optimization of community road layouts to prevent flooding and support the establishment of sponge cities.