52 inches of rain. it's almost insurmountable inconceivable to think that it could happen, particularly to the fourth-largest city in the united states. not to mention the surrounding areas is just one of those things you cannot plan for. >> this was an enormous storm. those reservoirs are really a result of the 1935 flood that flooded over 1 million acres of cotton field. now there's a million acres of buildings and homes. in that place. so we have builds in riskier areas and it's done all over the world. so now you need to take a look at where you should build and base the decisions on how much risk you should tolerate. >> there are wetlands in the area and some of that took place in the need to build and a lot