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Caroline Bay was a popular place last weekend as swimmers returned there several days after it was temporarily closed due to health risks. An Environment Canterbury spokeswoman explained the closure – from February 2 to 5 – had been prompted by water testing that showed high levels of faecal bacteria. This often occurred after high levels of rainfall, such as rainfall on January 28, she said. The rain could wash faecal material from birds and domestic animals from roads, pathways, roofs, and gardens into the stormwater system, which then ran into the bay. Because of this, health professionals advise people should not swim in waterways for at least 48 hours after rainfall. PHOTO: GRETA YEOMAN