This is an unprecedented event. While there are certain areas here that have flooded before during extreme rainfall events and can be expected to flood every time we get lots of rain in a short period of time, this time there are areas flooding that have never flooded before.

The Harris County Flood Control District has been creating huge flood mitigation areas upstream from these problem areas over the past few years in an effort to retain water upstream and control when the water will be released in order to lessen the effects of these events.

Everything they have done has been overwhelmed completely by the estimated 15 trillion gallons of rain that have already fallen, with another 5 trillion expected to fall by the end of Wednesday.

The Latest: Harvey rainfall would fill NFL football stadiums
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AJ