Matthew Angel Tufono had just celebrated his 51st birthday with loved ones. Hours later on his way to work, he became trapped in the chaos of rushing floodwaters.

"Developing in one part of the city can change the flood risk in another part of the city because of these drainage networks. All parts of cities are interconnected," explained Dr. Ali Mostafavi, a professor of Civil Engineering, Texas A&M University. "The drainage capacity is always behind the development."

The flash floods that swept San Antonio early Thursday killed thirteen people, and all but one of the victims has been identified.