Hundreds of homes have been inundated in and around Australia’s largest city in a flood emergency that was causing trouble for 50 000 people, officials said, writes ABC NEWS.

Emergency response teams made 100 rescues overnight of people trapped in cars on flooded roads or in inundated homes in the Sydney area, State Emergency Service manager Ashley Sullivan said.

Days of torrential rain have caused dams to overflow and waterways to break their banks, bringing a fourth flood emergency in 16 months to parts of the city of 5 million people.

Evacuation orders and warnings to prepare to abandon homes were given to 50,000 people, up from 32,000 on Monday, New South Wales Premier Dominic Perrottet said.

The New South Wales state government declared a disaster across 23 local government areas overnight, activating federal government financial assistance for flood victims.

Parts of southern Sydney had been lashed by more than 20 centimeters (nearly 8 inches) of rain in 24 hours, more than 17% of the city’s annual average, Bureau of Meteorology meteorologist Jonathan How said.