Stormwater that potentially contains hydrocarbons and heavy metals is lingering off Perth's beaches for up to 30 days after draining into the ocean, according to a world-first study.Modelling from the UWA Centre for Water Research has shown that stormwater stagnates near the shore for up to a month - raising the risk of an algal breakout - rather than being flushed away quickly as previously thought.
The problem is compounded by tidal flow from the Swan River, which is contaminated by run-off from hundreds of suburban drains.
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