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FLOW is typically expressed as some volume of water per second or minute. Common examples are gallons or liters per second (or minute), and cubic feet or cubic meters per second (or minute): Each can be easily converted to another, as follows:

  • 1 cubic foot = 7.481 gallons
  • 1 cubic meter = 35.31 cubic feet
  • 1 cubic meter = 1,000 liters
Method 1: Measuring Time to Fill ContainerThe Container Fill method works only for very small systems.

Build a temporary dam that forces all the water to flow through a single outlet pipe, Using a bucket or larger container of a known volume, use a stopwatch to time how long it takes to fill the container. Then, divide the container size by the number of seconds.

Example:

Container = 5 gallon paint bucket

Time to fill = 8 seconds

  • 5 gallons / 8 seconds = 0.625 gallons per second (gps)

To convert into Cubic Feet per Second (cfs):

  • 7.481 gallons per second = 1 cubic foot per second, so
  • 0.625 gps / 7.481 = 0.0835 cubic feet per second (cfs).
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