How much water is in a 14 inch pipe 4 miles long?

To calculate the volume of water in a 14-inch diameter pipe that is 4 miles long, first convert the diameter to feet (14 inches = 1.167 feet) and the length to feet (4 miles = 21,120 feet). The volume of a cylinder is given by the formula ( V = \pi r^2 h ), where ( r ) is the radius and ( h ) is the height (or length in this case). The radius is half the diameter, so ( r = 0.5835 ) feet. Plugging in the values, the volume of water in the pipe is approximately 14,626.4 cubic feet or about 109,000 gallons.