There's been a lot of flooding around the Dallas/Fort Worth Metroplex (and elsewhere in Texas). Here's a picture of Breckinridge Park in Richardson (a suburb of Dallas):
To really understand the scale, you have to realize that that's one of those waist-high trash cans off to the left of the gazebo in the "before" picture. It's the sort of structure that gets rented out for birthday parties and suchlike.
There are some impressive (and/or scary) videos floating around on YouTube as well.