The X system is based on water flow, not geometry. 1 X was originally meant to be the output of an XP 70, but it has been interpreted as a shortcut for 1 ounce per second.
As the flow is a rather complex problem, in general geometries can't be aligned with flow unless a variety of additional parameters are known. This is a very complex problem, and as such, the answer to which geometry is approximately what output is "it depends."
It's really not that simple. Water flow is not constant in most air pressure systems and is only reasonably constant in most CPS systems. That and it's a very complicated relationship that depends on far too many variables.