http://www.loudoun.gov/Default.aspx?tabid=3255
I have been here and rode this water slide.
You start 30 feet up and immediately drop down a small drop into the pitch black tube. You pick up speed really fast and think, this is not so bad after all, then OH MAN! you feel the crushing Gs, and the pain builds up all of a sudden as you whip around the little turn to be flung into the splash pool. I felt like I pulled 3 Gs! I love/hate that slide so much because you come out of like a cannon but it is so painful in the last very tight high G turn. My back was mashed into the slide so much in that last turn. I will be going here on Tuesday.