FloodsMap.com
Global ViewFlash Flood Alley + Gulf Surge

Texas Floodplain & Hurricane Surge Map

Texas flood map platform tracks both coastal storm surges in the Gulf of Mexico and severe riverine flash floods across Central Texas' Balcones Escarpment and Houston's expansive bayou networks.

Primary Threats:Balcones Escarpment Flash Flood Alley TorrentsHouston Flat Bayou Drainage Backwater PondingGulf Coast Hurricane Surges & Storm TrackingImpervious Urban Concrete Sheet Runoff

Loading High-Resolution Radar & GIS Engine...

Mean Elevation
1700 ft ASL
Coastal Exposure
367 Miles
High-Risk Parcels
2.1 Million+
Monitored Metros
5 Zones
Topographic & Hydrological Profile

Why Texas Floods: Geological Inundation Mechanics

Texas exhibits two distinct, high-impact flood regimes. In Central Texas, the Balcones Escarpment forms a steep geological fault line that forces warm, moisture-laden Gulf air upward, triggering localized torrential downpours. The thin rocky limestone soil cannot absorb intense rainfall, generating rapid runoff into narrow canyons (earning the region the title of 'Flash Flood Alley'—the most fatal flash flood zone in North America). Conversely, coastal Texas around Harris County is characterized by flat topography and dense Beaumont clay that drains exceedingly slowly, causing bayous to overtop and pool across vast metropolitan areas during stalled tropical storms.

Texas Key Metropolitan Risk Tiers

Elevations above sea level, coordinates, and predominant FEMA/regional flood classifications.

Houston / Galveston
43 ft ASL•Zone AE & VE
Extreme
Austin (Hill Country)
489 ft ASL•Zone AE (Flash)
High
San Antonio
650 ft ASL•Zone AE (Flash)
High
Corpus Christi
7 ft ASL•Zone VE & AE
High
Beaumont / Port Arthur
16 ft ASL•Zone AE
Extreme
Historical Benchmarks

Major Catastrophic Flood Disasters in Texas

201760.58 in Rain (US Record)

Hurricane Harvey

Stalled tropical cyclone dropped up to 60.58 inches of rain in southeastern Texas, inundating over 150,000 homes in Harris County and causing $125 billion in damage.

201544.9 ft Record Crest

Blanco River Flash Flood

Memorial Day storms caused the Blanco River in Wimberley to surge 33 feet in 3 hours, destroying bridges and sweeping away hundreds of vacation homes.

200138.8 ft Buffalo Bayou

Tropical Storm Allison

Over 40 inches of rain flooded the Texas Medical Center and Houston bayous, setting prior historic benchmarks for urban tropical inundation.

Regional Underwriting & Regulatory Mandate

Texas Property Code Section 5.008 requires home sellers to provide comprehensive flood disclosure notices detailing whether a property is located in a 100-year or 500-year floodplain, or has experienced past water penetration. Post-Harvey Harris County regulations mandate new residential foundations sit at least 2 feet above the 500-year flood elevation.

People Also Ask (Texas)

Frequently Asked Questions About Texas Flood Maps

State-specific answers on flood insurance regulations, storm surges, and high-risk elevation certificates.

The Balcones Escarpment creates an abrupt topographic lift that wrings moisture from tropical air masses. With steep rocky limestone hills and minimal soil absorption, rain instantly converts into fast-moving runoff, causing rivers like the Blanco, Guadalupe, and Colorado to rise tens of feet in a matter of minutes.
Explore Other Vulnerable Coastal & Delta Hubs

Compare Texas flood risk against other critical regions worldwide.

FloridaLouisianaBangladeshNetherlandsUnited KingdomVeniceJakartaMekong Delta