Abstract:To accurately evaluate the prevention and control effectiveness of sponge facilities in water-logging management and to explore the reasonable construction scale of sponge facilities for enhancingurban block rainwater and flood risk management capabilities, a SWMM rainfall-runoff dynamic mod-el was constructed. Multiple return period rainfall scenarios and multi-level control scenarios were de-signed to comprehensively analyze the rainwater and flood risk prevention and control efficiency ofsponge facilities. Three research blocks were selected based on historical waterlogging incidents andcurrent waterlogging risk conditions. Green roofs, permeable pavements, rainwater gardens, andgrassed swales were used as rainwater control measures. The cross-simulation results of multi-levelscenarios were analyzed by comparing the control and drainage relationships of rainfall runoff in termsof control capability decay index and parameter reduction rate, quantifying the rainwater flood risk pre-vention and control effectiveness of each control measure scheme under different rainfall return peri-ods. The results indicate that: ① Sponge facility management and control schemes effectively controlthe waterlogging risk in urban blocks, performing well under low return period rainfall but exhibitingcontrol gaps under high return period rainfall, requiring additional preventive and control measures; ②High deployment rate control schemes do not significantly improve the effectiveness of rainwater andflood control, with greater control capability decay for various parameters.
