"those flood zones that were recently built on" Most of the Houston MSA is a flood zone. The areas that were worst hit were not "recently" built on. The areas

"those flood zones that were recently built on" Most of the Houston MSA is a flood zone. The areas that were worst hit were not "recently" built on. The areas recently built on will have much better drainage because the codes have changed. I suggest doing more reading of primary sources and perhaps studying the hydrology and history before speaking further on this subject.