STORMWATER RUNOFF MANAGEMENT SCHEME USING LID-BMPs FOR A HISTORICAL SITE AND ITS PERFORMANCE EVALUATION

Due to inadequate construction of drainage systems in the past and strict reconstruction limitation at present, historical cultural reservation sites were prone to flooding in a heavy storm. Under the background of sponge city constuction promotion in China, the scientific rain water runoff management for the historical reservation sites turned out to be a key subject for the authority and the specialists. In this paper, historical auditorium surrounding area in Tsinghua University was selected as the case site. Aiming at sponge campus construction, we studied the natural based stormwater management schemes after the detail analysis of site present situation. We selected, designed and built four types of LID-BMPs (i.e., cistern, bioretention basin, porous pavement and swale) schemes in the area. Then, we used SUSTAIN model to evaluate the LID-BMPs' performance in water quantity-quality control and cost-profit balance. Results showed that the LID-BMPs system was able to meet the runoff control target in a designed storm and showed significant reduction in flow volume and pollutant load throughout a typical year.