- Steep Terrain & Narrow Valleys – The Balcones Escarpment (a fault line) creates steep hills and canyons that channel rainwater rapidly into creeks and rivers.
- Shallow Soil & Limestone Bedrock – The ground doesn’t absorb much water, causing heavy rain to quickly run off into streams.
- Intense Thunderstorms – The region frequently experiences slow-moving or stationary storms that dump massive amounts of rain in short periods.
- Urbanization – Cities like Austin and San Antonio have expanded, increasing paved surfaces that worsen runoff.
Notable Flood Events
- 1921 San Antonio Flood – One of the deadliest, killing 51+ people.
- 1998 Del Rio Flood – 15+ inches of rain in hours, causing major destruction.
- 2015 Memorial Day Flood (Austin/Wimberley) – Devastating floods killed dozens.
- 2021 Texas Floods – Widespread flash flooding in Central Texas.
Why is it Dangerous?
Flash floods here can happen within minutes, catching people off guard, sweeping away vehicles, and destroying homes near waterways.
