None, since there can be no conversion.
A gallon is a measure of volume in 3-dimensional space while a square foot is a measure of area in 2-dimensional space. The two measure different characteristics and, according to the most basic principles of dimensional analysis, any attempt at comparisons or conversions between the two are fundamentally flawed.
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The dimensions of an average 55 gal drum are 24in in diameter and 36in in height.
So, you simply take the formula for the circumference of a circle, which is
Cir = 2πr, where π=3.14 and r is the radius or half the diameter
AND multiply this number by the height.
This will give you the overall square inches of the surface of the drum.
THEN, divide this number by 144 sq in/sq ft. This will give you the square footage of the surface.
Here we have:
(2 x 3.14 x 12in) = 75.36in
75.36in x 35 in = 2637.6 sq in.
2637.6 sq in ÷ 144 sq in/sq ft = 18.32 sq ft.
213,000 gal / 7.48 gal /cubic foot =28,476cf /12ft(depth)=2373 sqft of surface area
1870.13 gallons per inch of depth. 144 sq. ins./sq. ft. X 3000 sq. ft.= 432,000 sq. ins. 1 gal. = 231 cu. ins. = 231 sq. ins X 1 in. deep. 432,000 sq. ins. / 231 sq. ins. per gal @ 1 in. depth = 1870.12987+ gallons @ 1 in.
(250,000,000 gallons) x (231 in3/gal) x (1 foot/12inch)3 x (1 acre/43,560 ft2) =767.221 acre-feet. (rounded) What does this mean ? Right now, it looks kind of ridiculous.Well, it's not so bad. It means a foot of rain over 767 acres, or about1.44 inches of rain over 10 square miles, which isn't so unreasonable.
8"gl" does not make any sensebut there are eight pints (abbreviated pt.) in a gallon (abbreviated gal.)
Yes