Volume of a cylinder = (pi) (radius)2 (length)
Volume = (pi) (0.25-ft)2 (20-ft) = 1.25 (pi) cubic feet = 3.927 cubic feet = 29.376 gallons (rounded)
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0.212 331 gallons per foot.
If 8 is the diameter, the formula for volume would be: pi r^2 h The radius would be half of the diameter: pi 4^2 h h is 1 foot or 12 inches pi 4^2 * 12 = 603.19 in^3 of water per foot.
10.4448, assuming 16" inside diameter. 16" outside diameter would be slightly less.
It depends on the diameter of the straw, which varies. Multiply the diameter by 3.14 and the result by the length of the straw.
Less than an inch.