Waterfall Braided Twistout is similar to doing a treebraid. Here are step by step instructions on how to achieve this look. You can also scroll down and watch the video tutorial.
Cornrow the section of hair about 3 notches, then release one of the 3 strands of hair.
Clip the left out strand away and continue cornrowing as usual. Repeat step 1.
When done with the row, you have the waterfall effect on the cornrow braid.
Removing each clip at a time, do a twist on each strand of "left-out" hair. You can curl the ends with perm rods, if necessary.
The finished results after unraveling the twist is a cascading twistout.
WATCH VIDEO to see tutorial and more information.