The worst of the flooding occurred in Houston, Texas, where over 35 inches (890 mm) of rain fell. Allison caused approximately $8.5 billion in damage (2001 USD), making it the costliest tropical cyclone that was never a major hurricane on record in the Atlantic basin.What areas in Texas are flooded?
The most common disaster in Texas is flooding. Most regions of the state are at risk. Flash flooding is also common, especially in areas where the terrain is steep and rocky. Flash floods are floods that happen very quickly.What is the average annual rainfall in Texas?
Rainfall/ Precipitation in San Antonio, Texas, Usa. San Antonio, Texas draws on average 786.9 mm (31 in) of rainfall per year, or 65.6 mm (2.6 in) per month. On average there are 82 days per year with more than 0.1 mm (0.004 in) of rainfall (precipitation) or 6.8 days with a quantity of rain, sleet, snow etc.