Influence of Optimization of Green Space Catchment Area on Old Campus on Rainwater Discharge and LID Facility Function:A Case Study of Shijiazhuang Tiedao University
The catchment area,serving as the fundamental unit for rainwater collection,significantly influences rainwater discharge,and optimizing its design can substantially enhance rainwater drainage efficiency.Taking Cui Garden and its surrounding areas at the Chang'an campus of Shijiazhuang Tiedao University as a case,this study investigates changes in elevation,drainage facilities,and the distribution of green spaces within the region.It calculates rainfall curves lasting 2 hours for the area with recurrence interval of 1 and 5 years,,and that lasting 24 hours with recurrence interval of 10 and 20 years.The study analyzes rainwater runoff,outflow,flood risk,and changes in the depth of key nodes under two scenarios:the current condition and the optimized catchment area,using the SWMM software.The results indicate that the optimized catchment area can effectively reduce runoff peaks by 79.7％to 91.9％,and decrease the overflow volume from stormwater wells.Installing low-impact development(LID)facilities in the optimized catchment area can also improve the infiltration efficiency of these LID facilities by 45.9％to 56.1％.To facilitate the strategy's application in the renovation of outdated campus green spaces,the study also integrates parametric design techniques,using the green spaces within the study area as an example,to organically merge the water collection function of green spaces with landscape forms.
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