Valle Crucis, North Carolina is where my family home has been for generations. It's located in the mountains besides a 70 foot valley. There is a one foot deep "creek" running along the bottom of that valley. In the past 100 years, it has flooded the house (on TOP of the mountain) by flash floods (read - one day rain storm) twice! So a valley (pretty large one at that) several miles long, gets full in less than a day... that is some freaky stuff.