Assessment of Sponge City Flood Control Capacity according to Rainfall Pattern Using a Numerical Model after Muti-Source Validation

Urban floods are a common urban disaster that threaten the economy and development of cities. Sponge cities can improve flood resistance ability reduce by setting low-impact measures (LID). Evaluating reduction benefits is basic link in construction sponge Therefore, it great significance to evaluate from perspective different rain patterns. In this study, we investigated runoff various rainfall patterns Mianyang city using Strom Water Management Model (SWMM). We employed 2–100-year return periods three temporal downscaling methods simulate Mianyang, with without implementation measures. After calibration, model performance was validated multi-source data concerning peaks inter-annual variations magnitude. Notably, effects peak on historical were generally greater than synthetic rainfalls generated downscaling. Compared events, protection capacities be easily overestimated when Overall, an earlier associated better capacity. context, results obtained study provide useful reference information about impact pattern control LID, used for design other part China.