Dams are usually the most common means of flood control along with storing water for drought.
Unfortunately, under Abbott and the first Trump administration, the problem was recognized but not fixed.
Texas, like Florida, doesn't have an income tax and uses real estate taxes as a main source of income. As the link notes below, by reducing property values, there's less revenue for the state. IMO, instead of putting a bandaid on the problem and reducing property values in the process, better to invest and generate greater revenue.
The problem with building dams is that it requires eminent domain; stripping Americans of their property and forcing them to move even though lake/reservoir front property generates higher property values along the shoreline.
2019:
SEGUIN — Texas officials will start draining four lakes next week in Guadalupe County in Central Texas without a plan in place for when the lakes, and the…
www.kut.org
SEGUIN — Texas officials will start draining four lakes next week in Guadalupe County in Central Texas without a plan in place for when the lakes, and the 90-year-old dams that support them, will be rebuilt.
Area homeowners, who got barely a month's notice, said they felt blindsided by the plan, and they say it will slash their property values, kill their beloved century-old cypress trees and render the lakes — which have hosted water skiing tournaments for decades — unusable.