# How to Calculate the Cubic Volume of a Section of Drainage
In agriculture, the number of acres drained and the slope of the drainage area tells you the volume of drainage pipe you need. To know how much pipe to lay, you have to know how to calculate the volume water a section of drainage pipe will hold. Home owners use drainage pipes for septic systems and gutter spouts. A drainage pipe is cylindrical, so you use the formula for the volume of a cylinder to calculate the pipe volume.
Things You'll Need
- Measuring tape
Instructions
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1
Measure the pipe for which you want to know the volume. You need to know the length of the pipe and the diameter of the pipe opening.
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2
Plug the measurements into the formula for the volume of a cylinder. The formula is pi times the radius squared times the height. Pi is 3.14, the radius is half the diameter of the pipe, and the height is the length of the pipe.
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3
Solve the equation. If the pipe is 24 feet long with an 8-foot diameter, the equation would be 3.14 times (4 times 4) times 24. In this case, the cubic volume is 1,205.76 cubic feet.
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