To cover an area of 1 square foot with 1/2 inch of water, you would need 0.623 gallons of water.
Covering that area requires 5.00507794 × 1011 US gallons of water.
Volume is two dimensional and no area can hold 25 gallons of water, however 25 gallons is a volume. Do you mean what dimensions would hold 25 gallons?
There area 264.2 (US) gallons of water in one cubic meter of volume.
40 square feet * 2 inches = 40*(1/6) = 6.66... cubic ft = 41.5 UK gallons or 49.9 US gallons (approx).
29174.02 gallons
With US gallons = 7.52 " With UK gallons = 9.03 "
A square meter of water would not be measured in gallons, as gallons are a measure of volume, while square meters are a measure of area. It would depend on the depth of the water in the square meter area to calculate the volume in gallons.
There are billions of gallons of water within the Indian Ocean. This ocean covers an area of 47,900,00 square miles.
The answer depends on the depth to which the deck is covered.
1 acre = 43,560 square feet1 cubic foot = 7.4805 gallonsVolume = (surface area) x (depth) = (43,560) x ( 1 ) = 43,560 cubic feet = 325,851 gallons (rounded)
This cannot be answered without knowing the depth of the water.