Why Harris County Had 31 100-Year Floods in 100 Years - Reduce Flooding {"@context":"https://schema.org","@graph":[{"@type":"Article","@id":"https://reduceflooding.com/2026/02/07/why-harris-county-had-31-100-year-
Why Harris County Had 31 100-Year Floods in 100 Years - Reduce Flooding
{"@context":"https://schema.org","@graph":[{"@type":"Article","@id":"https://reduceflooding.com/2026/02/07/why-harris-county-had-31-100-year-
Source: Reduce Flooding Blog - Bob Rehak
Date: 02/07/2026 8:19pm
Article Summary:
**Why Harris County Experienced 31 “100-Year” Floods in a Century: Misunderstood Risk, Development, and Changing Floodplains**
Harris County has experienced at least 31 so-called “100-year floods” over the past century because the term reflects a 1% annual probability, not a once-in-a-century guarantee, meaning such floods can occur repeatedly or even in consecutive years. The article explains that outdated flood maps, limited historical data, rapid upstream development, sedimentation, subsidence, and weak enforcement of floodplain regulations have all increased flood risk over time. Together, these factors help explain why extreme flooding has been far more frequent than the label suggests.
Read article here »
Date: 02/07/2026 8:19pm
Article Summary:
**Why Harris County Experienced 31 “100-Year” Floods in a Century: Misunderstood Risk, Development, and Changing Floodplains**
Harris County has experienced at least 31 so-called “100-year floods” over the past century because the term reflects a 1% annual probability, not a once-in-a-century guarantee, meaning such floods can occur repeatedly or even in consecutive years. The article explains that outdated flood maps, limited historical data, rapid upstream development, sedimentation, subsidence, and weak enforcement of floodplain regulations have all increased flood risk over time. Together, these factors help explain why extreme flooding has been far more frequent than the label suggests.
Read article here »