It doesn't rain a whole heck of a lot down here, and from what I can tell, when it finally DOES rain, it rains cats and dogs. And even though it doesn't usually rain for very long or for very many days in a row, the inability of the primarily-clay soil to absorb water means that low-lying areas flood very quickly.
I was shocked to discover, during my first Texas rain storm, that the park I regularly took the kids to was completely under water - FEET of water - just 45 minutes into the stretch of inclement weather.
The following day I drove by the same park and found it completely void of water. You would never have known it had even rained the day before.
Just another interesting observation about the weather and its impact down here...