20 was the previous answer.
In order to calculate the amount of water used, you would need to know what the gpm (gallons per minute) you have at where you are running the sprinklers. Some places are between 10 and 20 gallons of water per minute. Are you on city water? Your own well? Rural water sharing? They all play a part in the final answer.
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1 cubic mile = 1.10111715 × 1012 US gallons.
Water volume of 35.2 km3 (28,500,000 acre·ft)----- 28.5 million acre-feet x 43,560 square feet in an acre = 1.24 trillion cubic feet x 8.1 (gallons in a cubic foot) = 10 trillion gallons
17.8 gallons.
It will take about 8 gallons of drywall primer and 8 gallons of paint.
The United States Geologic Survey (USGS) estimates there to be 326,000,000 cubic miles of water on the planet. A cubic mile can hold a little more than 1.1 X 1012 gallons. The USGS also estimates that 96.5% of that water is in the planets oceans. 96.5% X (1,100,000,000,000 gallons per cubic mile) X (326,000,000 cubic miles) =============================== = 346,049,000,000,000,000,000 gallons.