1 acre = 43,560 square feet
1 million acre-feet = (106) x (43,560) x (1) = 4.356 x 1010 cubic feet = 325,851,428,600 gallons (rounded)
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1 acre = 43,560 square feet1 acre 5 feet deep = 43,560 x 5 = 217,800 cubic feet = 1,629,257 gallons (rounded)
1 acre = 43,560 square feet If the sides of the pond are straight ... its cross section area is 1/4 acre all the way down to the bottom ... then its volume is (43,560/4) x (5) = 54,450 cubic feet = 407,314.3 gallons
1 acre = 43,500 ft2vol = area * depth = 43,500*5 = 217,500 ft31 ft3 is approx. 7.48 gallons217,500 ft3 * (7.48 gal/ft3) = 1,626,900 gallons
An acre is a constant unit of measurement - an acre of anything is equal to an acre of anything else.
1,000,000 US gallons is about 134,000 cubic feet. A round tank of 56 feet diameter by 56 feet high will hold 1 million US gallons. Also a round pond of about 413 feet diameter by 1 foot deep.