Rapid and massive flooding of urban areas will only get worse with Climate Change. Houston is a prime example. The passed new building codes and budgeted billions for flood control in 2017. Tropical storm Imelda which hit 2 weeks ago shows that their efforts have not helped much. Houston has experienced one 500 year flood and 2 one hundred year flood since 2016. The cost of inaction or slow action will be much more. We need structural change.