There are no gallons of water in a square foot. Gallons is a unit of volume, and square feet is a unit of area, not volume. If you are asking about cubic feet, however, the answer is there are about 7.5 gallons in a cubic foot.
770/500 = 1.54 gallons per square foot
12,000 square meters is about 129,166.925 square feet.
A square foot cannot hold water its 2 dimensional. What you see is what you get . A one cubic foot container can hold 7.48 US gallons of liquid.
== 478.79 gallons, there are 7.481 gallons in a square foot. So that is 64 x 7.481== 478.79.==http://dictionary.reference.com/writing/styleguide/weights.html
A square foot has no volume. if you are asking how many gallons are in a cubic foot the answer id 7.4805195.
About 1,246 Imperial gallons (UK) or about 1,500 US gallons.
A gallon is a measure of volume whereas a square foot is a measure of area. So there are no gallons in a square foot and no square feet in a gallon.
One cubic foot of water is 7.4805 gallons.
12000 gallons of water is equivalent to 1600 cubic feet.
1 gallon
There are 7.48052 US gallons per cubic foot.