How Much Water Goes into a Burger?

I would have never guessed it - it takes a whopping 1300 gallons of water to produce one hamburger. At least this is what one of the studies cited by the Wall Street Journal claims (short blog version here). Holy cow! This is the size of a small pool! Well, other, more recent, estimates put the number much lower, about half as much, but still its plenty of water. I mean in this much water I can probably raise bunch of salmon or other fish. Then, the question is whether these studies even take into consideration such burger-related entertainment as drinking plenty of cheep beer and other similar activities which require water...

Damn, I am switching to fish. But not the toxic Chinese variety.