The other question is how did they flood and keep the site flooded as they worked? These may be the most important questions leading to answers regarding the function of G1 but no work has been done on them, perthaps, since Petrie expressed astonishment at finding the pavement was actually used to collect water;
Hence it runs on, till, close to the edge of the basalt pavement, it branches in two, and narrows yet more; one line runs W., and another turning nearly due S., emerges on the pavement edge at 629.8 to 633.4 from the N.E. corner of the pavement, being there only 3.6 wide. 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 Glen Dash Foundation did some work on this just this past summer but I'm not sure what the extent of the work was. If this site does follow the curve of the earth then there is no orthodox explanation for why it needed to be so flat and it is not consistent with the paradigm. It argues strongly against ramps as well.