A report from Environment Texas Research & Policy Center shows that San Antonio is second in the state for green infrastructure, a critical measure of how ready the city is in the event of flooding. Flood prevention is not only important for property but also for the environment.

"When runoff runs over surfaces it picks up whatever is on those surfaces whether it's roofing chemicals, even pet and animal waste from yards and parks get washed by runoff into our creeks, into our rivers," said Brian Zabcik with Environment Texas.

Green roofs are one way to capture excess rainwater. The gardens on top of building roofs have specific plants and soil that can filter out pollutants from runoff water. In San Antonio, green roofs cover the federal building, University Hospital and the Center for Sciences and Innovation Building at Trinity University.

"San Antonio did do very well, they came in second in our survey which is a reason for the city to be proud. However, the city actually scored 65 percent out of a 100 percent scale and 65 percent, of course, is a little bit more of a mid-range score and we believe that that indicates that the city can do more to support green infrastructure," Zabcik said.

One area of concern is San Antonio's creeks and rivers. All are classified as impaired by the state's environment agency, which means they're unsafe for swimming and fishing.