Regional distribution and mitigation benefit of LID facility based on SWMM
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Abstract:
To investigate the effect of low impact development (LID) facilities on alleviating urban flood disaster and reducing pollution load, four kinds of LID facilities were selected, including green roof, rainwater garden, permeable pavement and rainwater tank. By constructing the SWMM model, the catchment surface was divided into different partitions according to the actual terrain and pipe network direction. The influence of LID facility combination on runoff control and rainwater pollution load under the seven layout schemes was analyzed, the results showed that the LID facility combination could effectively reduce the runoff and rainwater pollution load for the seven layout schemes, and the LID facility combination has a better control effect on the runoff in the upstream and midstream areas. Under the same design rainfall return period, the reduction effect of each layout scheme was as follows: the whole area > upstream and midstream areas > midstream and downstream areas > upstream and downstream areas > downstream area > midstream area > upstream area. The runoff reduction rate in the downstream area was 5.19% - 6.82% higher than the upstream area, the upstream and midstream areas were 1.87%- 3.62% higher than the upstream and downstream areas, and 16.48%-18.97% higher than the downstream area. When the whole area was deployed, it was 29.60%-31.17% higher than the downstream area and 12.20% -13.12% higher than the upstream and midstream areas.Therefore, before the planning and construction of sponge city, it was suggested that: the LID facilities should be set up on demand in the whole area; in the transformation of old residential areas, the LID facilities could be emphatically considered in the upstream and midstream areas.
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