I had forgotten about his quote. There are trees growing in that rut / ravein.
Quote from Petrie
(who is bold enough to dispute Petrie water channel)
From this remarkable forking, it [p. 50] is evident that the trench cannot have been made with any ideas of sighting along it, or of its marking out a direction or azimuth; and, starting as it does, from the basalt pavement (or from any building which stood there), and running with a steady fall to the nearest point of the cliff edge, it seems exactly as if intended for a drain; the more so as there is plainly a good deal of water-weanng at a point where it falls sharply, at its enlargement. The forking of the inner end is not cut in the rock, but in a large block of limestone.
And...is it pure coincidence, the Grand Gallery points to the cliff. Water & gravity. Why break you back, when it's not necessary.
They also used this area to dump debris. They thought it was of no use. I have always wondered, what might be buried, below that debris.