In many areas of Texas you cannot build in a 100 year flood plain. In others, flood insurance is a requirement as are certain construction limitations, e.g. in Harris county [0]. Now, according to you these laws can't exist in Texas, but they do. Maybe you shouldn't say these things you don't understand, especially about a very liberal area.
$500 a year for flood insurance is still heavily taxpayer subsidized and the article you point to also says
Can I build on property in a floodplain?
A: Yes. However, floodplain development restrictions apply to grading, new construction and some renovations. Contact the Harris County Permit Office at (713) 956-3000 for more information on these requirements.
0 - http://www.eng.hctx.net/Consultants/Floodplain-Management/Fl...