Frank bowl flow diagram
For flows under 1 GPM the water stream curves slightly toward the wall. The stream is about 4.5 inches away from the wall.
At approximately 1 GPM the water stream develops a bulge just as it exits the spout with the sides moving inward. At this point it transitions from curving toward the wall to curving away from the wall. Overall the stream holds together fairly well, but it does tend to wander a bit.
2 GPM is the absolute maximum flow that the bowl can sustain without overflowing.
Spout was plumbed with ½ in pipe.