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Williamson County commissioners adopted the Atlas 14 Floodplain Mapping Study March 24, which identifies flood-prone areas to guide growth and development in the county, as well as helps reduce flood risk, according to county documents.
How it works: The Atlas 14 study identifies flood-prone areas using updated scientific rainfall data from the National Oceanic and Atmospheric Administration, as well as topographical information.
Williamson County will use the study for drainage and floodplain management in unincorporated areas of the county, according to a news release.
The Texas Water Development Board accepted the study in 2025, and with recent court approval, the study can regulate the floodplains and enforce permits for encroachment.
The impact: In the past decade, Williamson County has experienced severe flooding, including in 2010, 2015 and 2017. Most recently, deadly floods over the July 4, 2025, weekend devastated parts of the county.
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