Study on the influence of small water bodies filling on flood control and drainage

To study the influence of small and micro water body filling on regional flood control and drainage, the main urban area of Jiangyan was taken as the research object. Based on the flood process simulated by a Storm Water Management Model (SWMM) model under different rainfall patterns, a regional one-dimensional river network hydrodynamic large network model and a refined small network model were constructed. The large network model with a fixed utilization rate provides boundary conditions for the refined small network model, and the influence of small and micro water body filling on the flood process of the river network under different rainstorm intensities and underlying surface combinations was calculated. The results show that as rainfall increases, the flood water level and peak flow increase, and the flood arrival time advances. Under a 100-year rainstorm, the flood peak time of river channels after filling is advanced by 7.86 min on average (max 25 min); peak flow increases by 1.39% (0.8637 m³/s), and peak water level increases by 0.0103 m. The research conclusions can provide a scientific basis for urban flood control and territorial spatial planning.