This is what's commonly known as the Brides' Veil (or Bridal Veil) waterfall (you'll get a lot more hits if you Google for that). It is close to the A855 road, but about 1.5 miles south of the main Storr car park. There's a map and directions here:
http://www.walkhighlands.co.uk/Forum/viewtopic.php?f=9&t=33658 Don't be surprised to be underwhelmed by the size of the falls, though they are very attractive, and, unusually, are not improved by high water levels, when many of the subtle features get lost.
Hope you have a great trip!