Q: How much can 3 ft of 2x4 hold?

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1 * 3 * 3 CUBIC feet (not sq ft) = 9 cubic ft = 254.852 litres (to 3 dp).

1359L

None! It's A freakin' hole!

360 litres

5 ft x 3 ft x 3 ft = 45 ft3 1 ft3 ~= 7.481 gallons 45 ft3 * 7.481 gallons/ft3 ~= 336.6 gallons

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18ft3

A "board foot" is 1 inch thick, 12 inches wide, 12 inches long. A 12 ft 2x4 would be 8 board ft- 1/3 the width, but 2X the thickness.

1 * 3 * 3 CUBIC feet (not sq ft) = 9 cubic ft = 254.852 litres (to 3 dp).

1359L

A 2x4 is actually 1 1/2" by 3 1/2".

None! It's A freakin' hole!

360 litres

18 cu. ft

5 ft x 3 ft x 3 ft = 45 ft3 1 ft3 ~= 7.481 gallons 45 ft3 * 7.481 gallons/ft3 ~= 336.6 gallons

20 ft * 10 ft * 4 ft = 800 ft^3 1 ft^3 = 7.48052 gal 800 ft^3 * 7.48052 gal/ft^3 = 5,984.4 gal

The pond liner would be the surface area of a cube minus the top rectangle. 13x8 + 3x8 (2) + 3x13 (2) = 230 ft^2

561.0390 gallons 5x5x3=75 75x7.48051948(gallons in a cubic foot)=561.0390