Based on the conversion factor from gallons to cubic foot, one million gallons of water per day will cover a football by 2.3 feet.
To convert from gallons to cubic foot the following conversion factors are used:
The standard area for an American football field = 57,600 square feet
The height which one million gallons of water per day 15(Mgal/d), covers a football will then be:
Height = 134000 cubic foot / 57,600 square feet
Height = 2.3 feet.
Therefore, one million gallons of water per day will cover a football by 2.3 feet.
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