Sustainable Rainwater Utilization and Water Circulation Model for Green Campus Design at Tianjin University

Abstract

Considering green and sustainable concepts while planning, designing, constructing, and operating its new campus, Tianjin University built a green campus with a sustainable rainwater utilization and water circulation system. In the process of campus planning, Tianjin University set up a multilevel rainwater collection, usage, and discharging system with flood discharging as first priority and rainwater resource use as the second. In the process of designing and building the campus drainage area, Tianjin University developed a grassed swale and recessed green belt to build an integrated ecosystem of rainwater collection in order to reduce flood peaks and mitigate surface runoff pollution. Based on the concept of system optimization and sustainable development, the campus water environment system incorporated rainwater as a major water supplement while incorporating measures for pollution control, self-purification, and water circulation to construct a sustainable green campus water circulation model. Through reclaimed water and rainwater supplements to the artificial water body, circulation is achieved among artificial wet lands, central lake, waterfront area, and overflow lake.