About 10% of land in Austin is in the floodplain, subject to the dangers of flash flooding. The Floodplain Office administers local and federal development rules, meant to limit damage and protect lives, and maintains floodplain maps and models.
Austin’s floodplains are the areas likely to flood when our creeks rise and flow over their banks. Every creek and lake has a floodplain, regardless of whether it is mapped or not.
The work we do ensures that Austin is compliant with FEMA rules, protects lives and properties, and allows Austin residents access to more affordable, federally-backed flood insurance.
New floodplain maps for Gilleland, Elm, Decker and Walnut Creeks will become effective on Aug. 18, 2014. Find out more.
Floodplains change over time due to development, capital improvement projects and other factors. We periodically restudy watersheds to keep pace with such changes. We are currently re-studying 5 major watersheds. See the links below: