If you are into saving water for the future generations then you should think about switching to the vegetarian burger. The reason for this is the huge amount of water that is needed to make hamburgers.
According to a research, the amount of water needed to make one hamburger is around 660 gallons. A major portion of this water is used when processing the beef. To process one pound of beef, 1799 gallons of water is required. Similarly, 11 gallons of water is needed to make one slice of bread.
If we add up all the water requirements for the ingredients, in the same way, it goes up to 660 gallons as mentioned earlier. So next time you eat Hamburger, just remember how much water goes into your dish.