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.

Parts of southeast Texas were under flash flood warnings as excessive rainfall is expected in the Southern Plains states.

"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."

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.