SYDNEY (AP) — More than 30,000 residents of Sydney and its surrounds were told to evacuate or prepare to abandon their homes Monday as Australia’s largest city faces its fourth, and possibly worst, round of flooding in less than a year and a half.

Days of torrential rain caused dams to overflow and waterways to break their banks, bringing a new flood emergency to parts of the city of 5 million people.

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Australia’s Bureau of Meteorology manager, Jane Golding, said some areas between Newcastle, north of Sydney, and Wollongong, south of Sydney had received more than a meter (39 inches) of rain in the previous 24 hours. Some has received more than 1.5 meters (59 inches).

Those totals are near the average annual rainfall for coastal areas of New South Wales.