Ah ha! Much more detail here: http://www.sciencemag.org/content/341/6149/997.full
Seems that in some parts of the upper canyon, the ice configuration likely leads water away, but in the lower part, it controls the direction of water flow.
Ah ha! Much more detail here: http://www.sciencemag.org/content/341/6149/997.full
Seems that in some parts of the upper canyon, the ice configuration likely leads water away, but in the lower part, it controls the direction of water flow.