Torrential rain like Cyclone Gabrielle fell across the district in the past two days, causing widespread surface flooding and rivers to rise to warning levels. The  downpour on Sunday night overloaded the capabilities of the city's sewerage system, and the district council had to open the emergency valves and release sewage into the Tūranganui River at the Gladstone Road bridge. The Medical Officer of Health, river users and others who  might be affected were notified, and signs posted at swimming and recreation sites.

https://www.gisborneherald.co.nz/news/river-of-rain

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