基于海绵城市理念的慈城新城排水安全系统构建

保障城市排水安全是海绵城市建设的重要内容之一。宁波慈城新城建设尊重自然本底,探索可持续发展建设路径,科学构建了"源头减排-过程控制-末端调蓄"的排水防涝系统。通过道路及河道生物滞留带布置,以及新建项目的年径流总量控制率管控,实现了源头径流削峰减量。针对20年一遇的内涝防治标准,通过合理的竖向组织及中心湖生态调蓄空间的建设,实现了新城片区超标径流蓄排平衡,降雨期间大大减小了城市下游的排水压力,保障了城市排水安全。

Construction of Cicheng New Town Drainage Safety System Based on Sponge City Concept

To ensure the safety of urban drainage is one of the important contents of sponge city construction.Based on the natural background,Ningbo Cicheng New Town explores the construction path of sustainable development,and scientifically constructs the drainage and waterlogging prevention system of"source emission reduction,process control,as well as end regulation and storage".Through the layout of road and channel bioretention zone,as well as the control of total annual runoff of new projects,the peak source runoff was reduced.According to the 20-year flood control standard,through reasonable vertical organization and the construction of ecological storage space of the central lake,the balance of excess runoff storage and drainage was realized.The downstream drainage pressure during rainfall was greatly reduced,and the urban drainage safety was guaranteed.