 In 2010 the Western Australian government imposed restrictions on phosphorus levels in fertilisers due to concerns about the health of the Swan and Canning river system.The Perth Water location on the river adjacent to the City of Perth is a popular place for viewing the annual Australia Day fireworks, with over 400,000 people crowding the foreshore, Kings Park and boats on the river.Data collection of flood events in the estuary have been recorded since European arrival in 1829.