Family of San Antonio flood victim, Matthew Angel Tufono, said he had no reason to be on the access road of Loop 410, where his car was swept away by floodwater

The San Antonio River Authority maps and models floodplains, oversees flood infrastructure. They are gathering information on the areas and creeks that flooded Thursday so they can assess if changes need to be made.

This week in South Texas is expected to be much drier as a ridge of high atmospheric pressure moves into West Texas for a day or two.

"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."