Australian Flood Safety Guide
Understanding flood types, warnings, and how to stay safe
Overview
Flooding is Australia's most costly natural disaster, causing an average of $8.8 billion in damage annually. From the devastating 2010-2011 Queensland floods to the catastrophic 2022 Lismore floods, Australia experiences frequent and severe flooding events.
The Bureau of Meteorology issues Flood Watches and Warnings for river systems across Australia. These are categorised as Minor, Moderate, or Major flood levels, each with specific impacts on communities and infrastructure.
Flash flooding poses the greatest risk to life, with floods being Australia's second-deadliest natural hazard after heatwaves. The "If it's flooded, forget it" campaign emphasises that entering floodwaters - even in a vehicle - is extremely dangerous.
Causes & Contributing Factors
- Heavy rainfall from tropical systems and east coast lows
- Prolonged rain saturating catchments
- La Niña climate patterns bringing above-average rainfall
- Dam releases during high inflows
- Storm surge combined with high tides
- King tides and sea level rise affecting coastal areas
- Urban development increasing runoff
Safety Tips
If It's Flooded, Forget It
Never enter floodwaters - by foot or vehicle. Just 15cm of water can knock you off your feet, and 60cm can float a car.
Know Your Flood Risk
Check if your property is in a flood-prone area using local council flood maps. Know your local evacuation routes.
Prepare an Emergency Kit
Include important documents, medications, phone chargers, water, food, and battery-powered radio.
Move to Higher Ground Early
Don't wait for evacuation orders. If flooding is possible, move to higher ground while roads are still safe.
Avoid Stormwater Drains
Never enter stormwater drains during or after rain. Water can rise rapidly and the current is extremely strong.
Check on Neighbours
Elderly people, those with disabilities, and people with young children may need assistance evacuating.
Regional Information
Queensland
- 2010-2011 floods killed 35 people and caused $2.4 billion damage
- Brisbane River floods significantly impacted in 1893, 1974, 2011, and 2022
- Tropical cyclones often cause severe flooding in North Queensland
- Flash flooding common in Gold Coast hinterland
Frequently Asked Questions
Flood Warning Signs
- Bureau of Meteorology Flood Watch or Warning
- Heavy rainfall upstream or in your catchment
- Rivers and creeks rising rapidly
- Water appearing where it normally doesn't
- Drains backing up or overflowing
- Unusual sounds of rushing water
- Local dam spillway releases announced
Seasonal Risk Pattern
Peak flooding season in northern Australia. Monsoons and tropical cyclones cause widespread flooding.
East Coast Lows can cause severe flooding in NSW and Queensland. Catchments often saturated.
Southern Australia experiences flooding from cold fronts. Northern rivers typically dry.
Early storm season begins. East Coast Lows possible. Inland rivers may flood from storms.