Optimization of LID layout proportions in old city area based on SWMM
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Abstract:
The urban water logging takes place in the old city area frequently because of its high density of buildings and other characteristics of construction. Responding to this problem, this study used the LID module in SWMM model and chose Infiltration Trench, Permeable Pavement, Rain Barrel, and Bio-Retention Cell for simulation and analysis. We placed different proportions of LID measures (0.1%-15%) on the study area in design storm conditions with different return periods, so as to find the optimal proportions. At last, we combined these proportions to tentatively explore combination optimization. The results showed that the LID measures’ effect on design storms would diminish after their layout reached a certain proportion, which should be the optimal proportion. But the optimal proportions of individual measures cannot be directly applied to the combination scheme because of the interaction between individual measures. The combination optimization still needs further study.
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