National Cheng Kung University(NCKU) operates a monitored rainwater storage and reuse system that collects water from rooftops, swimming pool overflow, and other sources, with reclaimed water reused for campus ecological ponds, landscape irrigation, and toilet flushing. The system has been in operation since 2019, with publicly reported data documenting more than 94,542 tonnes of reclaimed water reused from 2019 to 2025. In 2025, the Central Axis Rainwater Recovery System recorded an annual flow of 22,126 tonnes. These publicly available records provide quantitative evidence of NCKU’s ongoing measurement and monitoring of water reuse across campus.
Water reuse measurement
6.4.2
SDG6
NCKU’s water reuse measurement
- NCKU’s Rainwater Retention System
A “rainwater storage system” and monitoring equipment have been established to systematically collect water from rooftops, swimming pool overflow, and other sources. After treatment, the recycled water is reliably used to supplement on-campus ecological ponds (such as Chenggong Lake), irrigate vegetation, and supply toilet flushing, significantly reducing tap water consumption.https://main-oga.ncku.edu.tw/p/412-1060-25898.php?Lang=zh-tw
Rainwater Storage and ReuseThe school repurposes the previously abandoned underground tunnel connecting the Chenggong and Guangfu campuses to create a rainwater storage system. Rainwater collected from the Science Building and the Computing Center is stored and used as supplementary water for irrigating Chenggong Lake, Rongyuan Garden, and for flushing toilets in Yunping Building. Since its launch in 2019, the system has reclaimed more than 94,542 tonnes of water.
https://main-oga.ncku.edu.tw/p/412-1060-11056.php?Lang=zh-tw
- Central Axis Rainwater Recovery System: 2025 Water Reuse Measurement
NCKU operates a Central Axis Rainwater Recovery System to collect and reuse rainwater on campus. Publicly available university data record a total annual flow of 22,126 tonnes in 2025, providing quantitative evidence of campus water recovery and reuse during the reporting year.https://ossd.ncku.edu.tw/%E6%A0%A1%E5%8B%99%E7%A0%94%E7%A9%B6%E8%B3%87%E8%A8%8A%E5%85%AC%E9%96%8B
- Real-Time Smart Water Usage Monitoring: Water Resource Management System at the Guangfu Campus
NCKU transformed an unused underground passage between Cheng Kung and Kuang-Fu Campuses into a rainwater storage facility, integrating water collection, storage, and reuse infrastructure. The recovered water is used for landscape irrigation, Chenggong Lake replenishment, and toilet flushing. From January to July 2025, the system recovered more than 8,106 tonnes of water, demonstrating the practical reuse of rainwater through campus infrastructure revitalization.