At https://www.google.com/search?client=firefox-b-1-d&sca_esv=26069c7dfc6c292a&channel=entpr&q=Guadalupe+river+flooding+in+the+past+texas&sa=X&ved=2ahUKEwiRpIe6x6aOAxWv38kDHUmEFcoQ1QJ6BAhKEAE

"AI Overview (Top of page)
Kerr County cleans up after rains send Guadalupe River to ...
The Guadalupe River in Texas has a history of devastating floods, with some of the most significant occurring in 1987, 1998, and most recently in 2025."
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https://www.gbra.org/wp-content/uploads/2021/04/StayingSafe.pdf

"The Guadalupe River experienced major floods in 1936, 1952, 1972, 1973, 1978, 1987, 1991 and 1997."
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https://www.seguintexas.gov/736/Historical-Flooding-in-Seguin

"Seguin, Texas is no stranger to flooding. The normally tranquil Guadalupe River can turn into a highly destructive force and is recognized as one of the top three most dangerous rivers in the state of Texas.

Several major destructive floods have occurred in our city over the years - in 1838, 1848, 1868, 1872, 1906, 1921, 1936, 1952, 1972, 1973, 1978, 1989, 1991, 1997, 1998, 2015, 2018, 2020 and 2021."
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Whereas this region is heavily tourist and recreation, the history of the region dictates that an effective flood warning system be in place. It would seem that no-one wishes to yell "flood" as it might scare the money away.

All in authority, past and present, who resisted an alarm system should be charged with first degree murder.

It really is that simple.