It is possible that some channels formed quickly during NASA floods.
Floods might have been more important than we think on ancient Mars. You can find the Red Planet crisscrossed by valley networks, once filled with flowing rivers. The deepest seem to have been formed quickly by cataclysmic flooding.
Many of the craters that mark the Martian surface had water up to 3.5 billion years ago. Timothy Goudge, University of Texas at Austin, and his collaborators mapped how often these craters were used.
