Texas has areas prone to flooding as well as areas with little precipitation. Most of the population lives in areas with normally adequate but moderate precipitation along Interstate Highway 35. The attached maps present this as well as the waterways which along with the coastal waters out to 10 miles belong to Texas.
Therefore, Texas is able (unlike the other states) to develop its own water resources because of the treaty that converted Texas from a nation to a USA state. If one area begins to flood, turbines could clear the flood by pumping it to areas needing water, normally from the east and Gulf coast to the north and northwest - see attachment. Another and/or supplemental approach is to build underground (or underwater in the Gulf of Mexico) aqueducts (kind of like a pipeline but much larger and not completely metal) to channel the water along the same depth across Texas.
Then a series of wind powered pumps could raise the water vertically in stages along the existing waterways. This might require additional dams along the existing waterways, and/or turbines to force the water into the aqueducts, and/or a series of aqueducts at progressively higher elevations. If you look at the Texas waterways map, you will see how feasible this would be, and how water could be moved across Texas for relatively low cost compared to the cost of flood damage, lack of development, and need for additional water supplies during droughts (like we are now experiencing).