Quantification of the Scale and Layout of Low Impact Development Facilities in the Central City of Dongping County Based on SWMM
Low Impact Development(LID)facilities can effectively address urban flooding issues caused by global extreme weather and urbanization processes.Currently,there are few studies on the quantification and layout of LID facilities at the urban scale.This article proposes a systematic method for LID scale quantification and spatial layout,with an empirical study using the central urban area of Dongping county as a case study.By constructing and validating an SWMM model,the study aims to control 75%of the annual runoff volume in the central urban area,laying out a total LID area of 984.25 hectares,mainly distributed across 96 flood-prone points.The construction areas for rain gardens,green roofs,permeable pavements,and sunken green spaces are 107.60 hectares,7.50 hectares,660.96 hectares,and 208.19 hectares,respectively,with a total retention volume of 670,590 cubic meters.Model simulation and validation indicate that the annual runoff control rate in Dongping's central urban area increased to 75.72%,achieving the expected target.The maximum peak runoff reductions for the old town,Dongping Economic Development Zone,Binhe New Area,Baifoshan Group,and Daqinghe Group are 56.65%,55.36%,53.02%,48.60%,and 2.90%,respectively.This study provides theoretical support and scientific basis for LID layout design at the urban scale.
storm water management modelsponge citylow impact development facilitieslandscape architecture