emergency
Flash Flood
Definition: A rapid flooding event occurring within hours of heavy rainfall or other water release.
A flash flood is a rapid rise of water, typically within six hours of heavy rainfall, dam failure, or sudden release of water. They're the most dangerous type of flood due to their speed and power.
Causes:
- Intense rainfall in short period
- Dam or levee failure
- Rapid snowmelt
- Ice jam breaking
- Mudslide blocking drainage
Why They're Dangerous:
- Little to no warning time
- Water rises extremely fast
- Powerful current (2 feet can sweep away a vehicle)
- Carries heavy debris
- Can occur far from rainfall
High-Risk Areas:
- Near streams and creeks
- Urban areas with poor drainage
- Low-lying areas
- Mountainous terrain
- Burn scar areas (wildfires)
- Areas downstream of dams
Warning Signs:
- Heavy rain upstream
- Rapidly rising water
- Unusual sound (roar of approaching water)
- Debris in water
What to Do:
If a Warning is Issued:
- Move to higher ground immediately
- Don't wait to see the flood
- Never walk through moving water
If Caught While Driving:
- Turn around, don't drown
- 6 inches of water can sweep you off your feet
- 2 feet of water can float a vehicle
- Never drive through flooded roads
Preparation:
- Know flash flood risk in your area
- Have emergency supplies ready
- Sign up for emergency alerts
- Have flood insurance
- Document belongings with home inventory
Related Terms
Flood Insurance
Separate insurance policy covering damage from flooding, not included in standard homeowner's policies.
Emergency Alert System (EAS)
A national public warning system that delivers emergency alerts through broadcast media.
Storm Surge
An abnormal rise in sea level caused by a storm, pushing water onto normally dry land.
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