Assessing the Effectiveness and Cost Efficiency of Green Infrastructure Practices on Surface Runoff Reduction at an Urban Watershed in China

摘要: Studies on the assessment of green infrastructure (GI) practice implementation effect and cost efficiency an urban watershed scale helps GI selection investment decisions for sponge city construction in China. However, few studies have been conducted these topics at present. In this study, Long-Term Hydrologic Impact Assessment—Low Development (L-THIA-LID) 2.1 model was applied to assess effectiveness practices surface runoff volume reduction watershed—the Hexi watershed, Nanjing City, Grassed swales, bioretentions, roofs, rain cisterns, permeable pavements, wet ponds, dry wetlands were chosen as potential based feasibility analysis. Results showed that grassed swales most cost-effective (0.7 CNY/m3/yr), but total not obvious due small area suitable locations. Permeable pavements performed best reduction, much lower. Correspondingly, bioretentions compromise practices. Green roofs least practices, with 122.3 CNY/m3/yr, it lower which 3.2 CNY/m3/yr. Wet implemented development areas, ponds (2.7 followed by (10.9 CNY/m3/yr). The annual could be reduced up 47.01% implementing buildup areas. Rain cisterns (RC) (PP) combination area, (BR) (GR) followed. (GS1), (DP), (WP), (WL) wise choices location This study also demonstrated L-THIA-LID evaluation effects