Volume of a cylinder = (pi) x (radius)2 x (length)
Volume of the hose = (pi) x (2 in)2 x (1200 in) = 15,080 cubic inches= 65.28 gallons
That's the volume of the hose. We have no way to tell how much water
there may be in it.
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There need not be any water at all in the hose! The capacity of the hose is 1.67 cubic feet.
8.15 gallons
It is an accepted fire service understanding that 5" Large Diameter Hose (LDH) will hold 1 gallon/ft. On average a 100' section of 5" empty weighs 110 lbs. With water weighing 8.33 lbs/gal. a 100' section of LDH filled with water will weigh approximately 944 lbs.
volume = pir2h pi = 3.1416 h = 100 feet r = 1/2 X diameter r = 1/2 X 3/4 inch / 12 inches/ft = 0.03125 square feet volume = 3.1416 X (0.03125)2 X 100 = 0.3 cubic feet
100 As 12 inch = 1 foot 10 x 10 = 100 100 / 1 = 100