Tainan Rivers – Cleanup and Swim Vision
Four priority rivers form the backbone of Tainan’s swimmable city strategy. Each page outlines current issues, targeted actions, and pilot sites to reopen safe public access as water quality improves.
- Zengwen River
Southern Taiwan’s largest river system, shaping the Tainan plains and estuarine wetlands. Key opportunities include floodplain reconnection, sediment-smart habitat design, and low-flow water quality polishing near the estuary.
Key Issues: High sediment loads and variable flows from monsoon/typhoon cycles · Nutrient and stormwater inputs from urban and agricultural catchments - Yanshui River
A central Tainan waterway passing through mixed residential, industrial and green areas; a prime candidate for stormwater pollution control and swimmability pilots.
Key Issues: Dry-weather baseflow occasionally affected by diffuse inputs · Storm overflows carrying urban runoff and debris - Erren River
A historically impacted river spanning Tainan and Kaohsiung; recent remediation opens the door to a new ecological corridor and carefully staged public access.
Key Issues: Legacy industrial pollutants in sediments in some reaches · Stormwater-driven spikes in turbidity and bacteria - Jishui River
A lower-gradient river with strong agricultural connections; restoration can focus on nutrient reduction, buffers, and community access.
Key Issues: Nutrient runoff (nitrate, phosphorus) from agriculture · Low-flow stagnation spots affecting clarity - Anping Canal
Historic canal linking Tainan’s waterfront and cultural districts; a prime estuarine corridor for water-quality polishing, floating wetlands and calm-water swim coves.
Key Issues: Tidal exchange and harbor activities influencing clarity · Urban runoff inflows after rainfall