> Once you have the velocity of the water as it leaves the hole, plain 
> old highschool physics will give you the parabola.

I don't think you GET the velocity.  Hydrodynamics probably gives
you speed, but since direction is determined by non-rigid fluids
pushing non-rigid fluids in randomish directions as it exits the
orifice, you don't know the exact direction that your stream (or
even parts of your stream) is traveling, and (as noted) the impact
point varies a lot.  Producing one of those Disney-style hopping
water pulse things is apparently a lot harder than you'd think,
sorta like the difference between flashlight beams and laser beams.

BillW
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