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Historical Flooding in Sebastian

• During the November 2023 floods, with about 13–14 inches of rain in parts of Indian River County, there was extensive flooding, but no reports of the Sebastian River or nearby waterways rising by more than a few feet. The flooding persisted for days, but it was not a sudden, vertical surge like in Texas.

4. Florida's Drainage and Wetlands

• The Sebastian area has extensive wetlands and drainage canals that help absorb and slowly release excess water, reducing the chance of a sudden, massive river rise.

What Would Happen If Sebastian Got 13 Inches in 3 Hours?

• You would see major flooding:

• Streets, yards, and low-lying areas would flood rapidly. Water could enter homes and make some roads impassable.

• The river would rise, but not by 26 feet:
  The Sebastian River is not likely to experience a vertical rise anywhere near what happened in Texas. Instead, water would spread out across the floodplain, causing prolonged flooding rather than a flash flood surge.

• Infrastructure would be overwhelmed:
  Drainage systems would struggle to keep up, and floodwaters could linger for days.

• Summary Table: Texas vs. Sebastian Flood Response

• FactorTexas (Guadalupe River)Sebastian, FL (Sebastian River)

• Rainfall13 inches in 3 hours13–14 inches in 24–48 hours

• River Rise26 feet in less than 1 hourTypically a few feet, not 26 feet

• Flood TypeFlash flood, rapid surgeWidespread, prolonged flooding

• TerrainSteep, rocky, fast runoffFlat, marshy, slow runoff

• Typical ImpactsCatastrophic, deadly surgesRoad closures, property flooding

• Conclusion

• Even if Sebastian received 13 inches of rain in 3 hours, the river behind your house would not rise by 26 feet. You would see severe flooding, but due to the flat terrain and the way water spreads out in Florida, the rise would be much less dramatic and more gradual than in Texas. The risk would be to property, roads, and infrastructure, rather than a sudden, towering river surge.

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