I don't think a water game will happen for the following reasons:
A) Practice fields would be INSANELY hard to construct, because in addition to the field elements, teams would have to basically build a POOL to test their robot in.
B) It occurs to me that dripping wet robots being constantly wheeled to and from the field would create an enormous wet floor hazard throughout the pits.
C) Aside from the obvious problems of robots sinking and then needing their entire electrical system replaced, the water would quickly become polluted with grease and who knows what else. Besides the "yuck" factor, how would FIRST dispose of this water after the event?
D) Considering how much damage was done to the fields this year, I shudder to think what could happen with a water filled field. (Tsunami!!

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"You can't spread Democracy with the barrel of a gun" ~ Helen Thomas
2006 Great Lakes Regional Semi-Finalists (Thanks to our allies: Team 66 and Team 68)
Thanks 469 for lending us your old OI in ATL!