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The Mythical 100 Flood Plain
Clear Creek At I-45
Houston, Texas
James K. Orr
September 12, 2017
Purpose – Show Two “1000 Year Flood”
Events In 40 Years In Harris County, Texas
• 40 + Inches of rain from a tropical system
near Houston is a regular occurrence
– See chart 5, Top 1, 4 and 5 events over past 40 years
• Per the “official” flood plain definition, Clear
Creek at I-45 has had a “once in 1055 years”
flood in 1979 (Claudette) and a “once in 761
years” flood in 2017 (Harvey) in 40 years
– Allison in 2011 was only a once in 29 year flood
– See charts 10 - 14
An Introduction To Floods
• One of my early experiences in living in the Gulf
Coast was Claudette on July 15, 1979
– In late-July 1979, the center of Tropical Storm
Claudette moved slowly inland near the
Texas/Louisiana border. Torrential rainfall fell along
the southeast Texas coast, including the
Houston metro area.
– The heaviest amount was recorded just to the south
of Houston in the town of Alvin. An observer
measured a record 43 inches of rainfall in just 24
hours, which stands as the greatest 24-hour rainfall
total in U.S. history. The storm total beyond the 24-
hour record was 45 inches.
http://www.wpc.ncep.noaa.gov/tropic
al/rain/claudette1979.html
Harvey Floods Houston
https://www.harriscountyfws.org/
Gauge 110
Clear Creek @ I-45
Rainfall per 12 Hours During
Peak 3 Days -- Clear Creek at I-45
Rain to 12 PM August 28
Another Day Of Heavy Rain To Come
Additional Rainfall
Harris Count Flood Warning System
Official Flood Plane Information
Clear Creek at I-45
Actual Historical Data
Logarithmic Scale
Actual Historical Data
Linear Scale

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The mythical 100 flood plain Houston Texas 2017