one gallon-year per acre per square second is very close to 66 mph
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@diodelass How are you defining "very close"? Because unless I did my math wrong, I'm getting that it's close to 33 mph
@diodelass I figured out where I messed up my maths. I accidentally put 12 hours in a day instead of 24. (This is why my physics colleagues won't be able to trust me with a particle collider 
)
@auravulpes uh, we're going off of what `units` gave us
you have: 1 (gallon*year)/(acre*second^2)
you want: mph
* 66.030356
/ 0.01514455