What is Changing?


A National Weather Service study of historic rainfall totals and localized flooding events has lead the city of Austin to begin changing floodplain and drainage regulations in 2018. Part of the change includes redefining the 100-year flood plain. Study results show that recent events mean that some property that was previously within the 500-year flood plain should now be considered at the same risk level as properties in the 100-year boundary. 

The map has to be redrawn. While the new boundaries are being identified, the city has changed its regulations and is preparing to hold all properties within the 500-year boundary to the standards required of properties within the 100-year boundaries. Property owners and businesses within the 500-year plain that want to expand, remodel, or make other improvements to their property now have new restrictions to follow. In Austin alone this is expected to affect 2,800 buildings and 3,400 acres.

What’s Next?

After public hearings were held in July and early August, the Austin City Council will hold public meetings to be scheduled this fall. Word is that the cities of Cedar Park and Leander are already expecting to follow Austin’s lead.

What Do I Need to Do?

What do you need to do if you own or are considering buying affected properties withing the 500-year flood plain? Pay attention to City Council meetings, watch for media updates, and be prepared to abide by restrictions that apply to the 100-year flood plain.

Where Can I Find Updates?

Austin Floodplain Management 
Watershed Protection Department

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