Williamson County kicked off the Atlas 14 Floodplain Mapping Study in spring of 2021 to update rainfall data throughout the county, model streams and waterways, and identify where flood risks are located.
The National Oceanic & Atmospheric Administration (NOAA) has compiled and analyzed historical rainfall records to produce updated precipitation-frequency estimates across the country. This data, commonly known as NOAA Atlas 14 rainfall, was provided to Texas in 2018. In 2019, the state legislature tasked the Texas Water Development Board (TWDB) to identify areas at risk of flooding and potential mitigation measures. Accordingly, in 2021, the TWDB partnered with Williamson County to conduct the Atlas 14 Floodplain Mapping Study to:
• Update floodplain information throughout the county with the most recent scientific data including NOAA Atlas 14 rainfall
• Model streams and waterways that have never been studied
• Gather accurate information about topography, drainage structures and bridges
• Develop mitigation measures that could be implemented to reduce flooding
A public meeting was held on March 29 and April 6 to provide the community information about the study and to gather anecdotal information about flooding on private property. The county is asking for anecdotal information and photos/videos about flooding on your property to be included in the data collection process. If you have information about flooding on your property such as photos or videos, please submit it to
atlas14@wilco.org or mail it to the Public Affairs Office at 710 S. Main Street, Ste 101, Georgetown, TX 78626. You may also fill out this
questionnaire. This information will help the technical team corroborate their findings.